Fair Value Measurements Narrative (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of senior secured notes	$ 232,313		$ 232,313
Carrying value of senior secured notes	210,000		210,000		210,000
Estimated fair value of convertible debt	67,189		67,189
Carrying value of convertible debt	57,500		57,500		57,500
Line of Credit Facility, Fair Value of Amount Outstanding	22,226		22,226
Line of Credit Facility, Amount Outstanding	22,850		22,850		0
Forward Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	0		0		0
Derivative, Notional Amount	9,820		9,820
Gain (Losses) as a result of changes in the fair value of the contracts	$ 217	$ (874)	$ (69)	$ (2,173)
Convertible Notes due December 15, 2017 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Stock price at the end of the period	$ 11.04		$ 11.04
Expected volatility			27.20%
Credit spreads			4.61%
Risk-free interest rate			1.25%