Debt (Details) (USD $)								0 Months Ended	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Mar. 31, 2013 10.75% senior notes due 2019	Dec. 31, 2012 10.75% senior notes due 2019	Apr. 05, 2012 Credit Agreement	Dec. 31, 2012 Credit Agreement Maximum	Apr. 05, 2012 Senior secured Term Loan A due 2017	Mar. 31, 2013 Senior secured Term Loan A due 2017	Dec. 31, 2012 Senior secured Term Loan A due 2017	Mar. 31, 2013 Senior secured Term Loan A due 2017 Minimum	Mar. 31, 2013 Senior secured Term Loan A due 2017 Maximum	Apr. 05, 2012 Senior secured credit facility	Mar. 31, 2013 Obligations under capital leases	Dec. 31, 2012 Obligations under capital leases	Mar. 31, 2013 Notes payable and other	Dec. 31, 2012 Notes payable and other
Long-term debt and obligations under capital leases
Long-term debt and capital lease obligation	$ 382,778,000	$ 390,799,000		$ 200,000,000	$ 200,000,000				$ 164,076,000	$ 170,625,000				$ 16,566,000	$ 17,683,000	$ 2,136,000	$ 2,491,000
Less current portion	15,843,000	20,747,000	5,694,000											5,800,000
Long-term debt and obligations under capital leases	366,935,000	370,052,000
Interest rate (as a percent)				10.75%	10.75%
Aggregate amount available						375,000,000		175,000,000					200,000,000
Percentage of original principal amount to be amortized during each of the first two years after funding								5.00%
Number of years after funding during which five percent of original principal amount will be amortized								2 years
Percentage of original principal amount to be amortized during the third year after funding								10.00%
Percentage of original principal amount to be amortized during the final two years of the term								15.00%
Number of final years of the term of loan during which 15 percent of original principal amount will be amortized								2 years
Variable rate basis									LIBOR
Interest rate margin (as a percent)									2.75%		2.25%	3.00%
Option to increase the available additional borrowing capacity							$ 175,000,000