Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jan. 09, 2014
Stockholders' Equity [Line Items]          
Sale of Stock, Price Per Share         $ 45.75
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance     $ 841,392 $ 694,210  
Balance, shares     36,244,071   2,530,000
Net earnings as reported 35,079 28,143 60,456 40,184  
Exercise/vesting of equity awards, value     707 10,916  
Equity award compensation expense     5,264 3,941  
Excess income tax benefit from stock-based awards     2,194 1,687  
Issuance of stock, value     110,420    
non-controlling interest acquisition       (257)  
Balance, shares 39,121,706   39,121,706   2,530,000
Balance 1,020,319 750,681 1,020,319 750,681  
Stockholders' Equity, Other     (114)    
Common Stock [Member]
          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance     362 356  
Balance, shares     36,244,000 35,613,000  
Net earnings as reported     0 0  
Exercise/vesting of equity awards, shares     348,000 603,000  
Exercise/vesting of equity awards, value     4 6  
Excess income tax benefit from stock-based awards     0 0  
Equity award compensation expense     0 0  
Issuance of stock, shares     2,530,000    
Issuance of stock, value     25    
non-controlling interest acquisition       0  
Balance, shares 39,122,000 36,216,000 39,122,000 36,216,000  
Balance 391 362 391 362  
Stockholders' Equity, Other     0    
Additional Paid In Capital [Member]
          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance     412,961 390,249  
Net earnings as reported     0 0  
Exercise/vesting of equity awards, value     703 10,910  
Equity award compensation expense     5,264 3,941  
Excess income tax benefit from stock-based awards     2,194 1,687  
Issuance of stock, value     110,395    
non-controlling interest acquisition       (257)  
Balance 531,403 406,530 531,403 406,530  
Stockholders' Equity, Other     (114)    
Retained Earnings [Member]
          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance     428,069 303,605  
Net earnings as reported     60,456 40,184  
Exercise/vesting of equity awards, value     0 0  
Excess income tax benefit from stock-based awards     0 0  
Equity award compensation expense     0 0  
Issuance of stock, value     0    
non-controlling interest acquisition       0  
Balance 488,525 343,789 488,525 343,789  
Stockholders' Equity, Other     $ 0