Fair Value Disclosures (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Jun. 23, 2015	Dec. 31, 2014	Jun. 30, 2014
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Stated interest rate (percent)		6.00%
7.50% Notes [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Stated interest rate (percent)	7.50%		7.50%
7.5% Senior Exchange Convertible Notes [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Stated interest rate (percent)	7.50%		7.50%
4.50% Notes [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Stated interest rate (percent)			8.50%
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Contingent Consideration, Fair Value	$ 1,198		$ 2,404
Estimate of Fair Value, Fair Value Disclosure [Member] | Notes and Senior Exchange Convertible Notes [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Notes Payable, Fair Value Disclosure	55,201		99,040
Estimate of Fair Value, Fair Value Disclosure [Member] | 8.5% Senior Notes Due 2019 [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Notes Payable, Fair Value Disclosure	193,500		193,000
Estimate of Fair Value, Fair Value Disclosure [Member] | 6.00% Notes [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Notes Payable, Fair Value Disclosure	80,000		0
Carrying Amount [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Contingent Consideration, Fair Value	1,198		2,404
Carrying Amount [Member] | Notes and Senior Exchange Convertible Notes [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Notes Payable, Fair Value Disclosure	55,339		99,956
Carrying Amount [Member] | 8.5% Senior Notes Due 2019 [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Notes Payable, Fair Value Disclosure	200,000		200,000
Carrying Amount [Member] | 6.00% Notes [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Notes Payable, Fair Value Disclosure	$ 79,872		$ 0
Senior Notes [Member] | 8.5% Senior Notes Due 2019 [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Stated interest rate (percent)	8.50%			8.50%
Senior Notes [Member] | 6.00% Senior Convertible Notes Due 2020 [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Stated interest rate (percent)		6.00%