Annual report pursuant to Section 13 and 15(d)

Fair Value Disclosures (Details 1)

v2.4.0.8
Fair Value Disclosures (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
7.731% senior subordinated notes due 2017 [Member]
Level 2 [Member]
Dec. 31, 2013
Senior Notes Due Two Thousand Eighteen [Member] [Domain]
Dec. 31, 2013
Senior Notes Due Two Thousand Eighteen [Member] [Domain]
Level 2 [Member]
Dec. 31, 2013
7.15% senior notes due 2020 [Member]
Level 2 [Member]
Dec. 31, 2012
7.15% senior notes due 2020 [Member]
Level 2 [Member]
Apr. 30, 2012
7.00% senior notes due 2022 [Member]
Dec. 31, 2013
7.00% senior notes due 2022 [Member]
Level 2 [Member]
Dec. 31, 2012
7.00% senior notes due 2022 [Member]
Level 2 [Member]
Dec. 31, 2013
1.875% convertible senior notes due 2032 [Member]
Level 2 [Member]
Dec. 31, 2012
1.875% convertible senior notes due 2032 [Member]
Level 2 [Member]
Debt Instrument [Line Items]                    
Aggregate Principal $ 99,825 $ 175,000 $ 175,000 $ 300,000 $ 200,000 $ 300,000 $ 300,000 $ 300,000 $ 126,500 $ 126,500
Fair value of fixed-rate debt                    
Estimated Fair Value $ 102,950   $ 174,125 $ 325,500 $ 220,760   $ 318,750 $ 328,500 $ 142,154 $ 127,449