Fair Value Disclosures - Carrying and Fair Values of Financial Instruments (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
4.50% Notes [Member]
Notes, mortgage notes and other debt [Abstract]
Stated interest rate (percent)		8.50%	4.50%
7.50% Notes [Member]
Notes, mortgage notes and other debt [Abstract]
Stated interest rate (percent)	7.50%	7.50%	7.50%
7.5% Senior Exchange Convertible Notes [Member]
Notes, mortgage notes and other debt [Abstract]
Stated interest rate (percent)	7.50%	7.50%	7.50%
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Notes Payable, Fair Value Disclosure	189,860,000	193,000,000
Contingent Consideration, Fair Value	1,304,000
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	99,434,000	99,040,000
Carrying Amount [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Notes Payable, Fair Value Disclosure	200,000,000	200,000,000
Contingent Consideration, Fair Value	1,304,000	2,404,000
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	99,956,000	99,956,000