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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 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, shares     36,244,071   2,530,000
Balance     $ 841,392 $ 694,210  
Net earnings as reported 32,577 38,191 93,033 78,375  
Exercise/vesting of equity awards, value     734 11,225  
Excess income tax benefit from stock-based awards     2,197 1,733  
Equity award compensation expense     9,035 7,040  
Issuance of stock, value     110,420    
Other     (114)    
Non-controlling interest acquisition       (257)  
Balance, shares 39,125,006   39,125,006   2,530,000
Balance 1,056,697 792,326 1,056,697 792,326  
Common Stock [Member]
          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, shares     36,244,000 35,613,000  
Balance     362 356  
Net earnings as reported     0 0  
Exercise/vesting of equity awards, shares     351,000 618,000  
Exercise/vesting of equity awards, value     4 6  
Equity award compensation expense     0 0  
Issuance of stock, shares     2,530,000    
Issuance of stock, value     25    
Other     0    
Non-controlling interest acquisition       0  
Balance, shares 39,125,000 36,231,000 39,125,000 36,231,000  
Balance 391 362 391 362  
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     730 11,219  
Excess income tax benefit from stock-based awards     2,197 1,733  
Equity award compensation expense     9,035 7,040  
Issuance of stock, value     110,395    
Other     (114)    
Non-controlling interest acquisition       (257)  
Balance 535,204 409,984 535,204 409,984  
Retained Earnings [Member]
          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance     428,069 303,605  
Net earnings as reported     93,033 78,375  
Exercise/vesting of equity awards, value     0 0  
Equity award compensation expense     0 0  
Issuance of stock, value     0    
Other     0    
Non-controlling interest acquisition       0  
Balance $ 521,102 $ 381,980 $ 521,102 $ 381,980