Debt - Schedule of Convertible Debt (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013		Aug. 31, 2009
Schedule of Convertible Debt [Line Items]
Net carrying amount of debt	$ 129,706,000		$ 127,749,000
Common stock	8,850,000		8,850,000
4.50% Senior Exchangeable Notes [Member]
Schedule of Convertible Debt [Line Items]
Principal amount of debt	130,973,000		130,973,000		172,500,000.0
Unamortized discount	$ (1,267,000)	[1]	$ (3,224,000)	[1]
Fixed interest rate	4.50%	[2]			4.50%

[1] The discount for the 4.50% notes will be amortized through August 2015.

[2] Our Senior Exchangeable Notes maturing in 2015 were discounted by $1.3 million and $3.2 million as of December 31, 2014 and 2013, respectively. Upon maturity the liability will be $131 million.