Basic and Diluted Net IncomePer Share Anti-Dilutive Securities (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options	3,465,000	2,555,000	2,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	3,465,000	2,555,000
Total equity award shares excluded	3,993,000	3,082,000	3,410,000
Convertible Debt Securities [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total equity award shares excluded	2,110,000	3,517,000	3,454,000
Convertible Debt Securities [Member] | 2013 Convertible Senior Notes [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total equity award shares excluded	0	2,450,000	3,454,000
Convertible Debt Securities [Member] | 2015 Convertible Senior Notes [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total equity award shares excluded	2,110,000	1,067,000	0
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	335,000	527,000	510,000
Performance Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	193,000	0	0
Long-term Incentive Plan [Member] | Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities Excluded from Computation of Earnings Per Share, Performance Target Not Met, Amount	1,500,000	2,300,000	800,000