Fair Value Measurements Narrative (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of senior secured notes	$ 263,813
Carrying value of senior secured notes	218,335
Estimated fair value of convertible debt	95,000
Stock price at the end of the period	$ 14.77
Estimated fair value of the line of credit	37,775
Carrying value of the line of credit	40,000
Expected volatility	22.30%
Credit spreads	8.22%
Risk-free interest rate	0.36%
Estimated fair value of convertible notes	37,334
Forward Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Notional Amount	17,191	15,486
Gain (Losses) as a result of changes in the fair value of the contracts	$ 430	$ 2,377