Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Long-term debt obligations
Total debt	$ 116,375	$ 179,438
Less current maturities	12,250	69,188
Total long-term debt	104,125	110,250
2008 Term Loan Facility [Member]
Long-term debt obligations
Total debt	0	60,000
2010 Revolving Credit Facility [Member]
Long-term debt obligations
Total debt	0	0
2011 Term Loan Facility [Member]
Long-term debt obligations
Total debt	$ 116,375	$ 119,438