Debt (Details) (USD $)	3 Months Ended	12 Months Ended							0 Months Ended	12 Months Ended		12 Months Ended								12 Months Ended
	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2013 10.75% senior notes due 2019	Dec. 31, 2012 10.75% senior notes due 2019	Dec. 22, 2010 10.75% senior notes due 2019	Apr. 05, 2012 Credit Agreement	Dec. 31, 2013 Credit Agreement Maximum	Apr. 05, 2012 Senior secured Term Loan A due 2017	Dec. 31, 2013 Senior secured Term Loan A due 2017	Dec. 31, 2012 Senior secured Term Loan A due 2017	Dec. 31, 2013 Senior secured Term Loan A due 2017 Minimum	Dec. 31, 2013 Senior secured Term Loan A due 2017 Maximum	Dec. 31, 2013 Senior secured Revolving Facility	Apr. 05, 2012 Senior secured Revolving Facility	Dec. 31, 2013 Obligations under capital leases	Dec. 31, 2012 Obligations under capital leases	Dec. 31, 2013 Notes payable and other	Dec. 31, 2012 Notes payable and other	Dec. 31, 2013 Standby letters of credit
Long-term debt and obligations under capital leases
Long-term debt and capital lease obligation		$ 390,799,000	$ 380,037,000	$ 200,000,000	$ 200,000,000					$ 157,513,000	$ 170,625,000					$ 20,240,000	$ 17,683,000	$ 2,284,000	$ 2,491,000
Less current portion		20,747,000	20,807,000													6,500,000	6,000,000
Long-term debt and obligations under capital leases		370,052,000	359,230,000
Issuance of debt						200,000,000
Interest rate (as a percent)				10.75%	10.75%
Debt instrument issuance as a percentage of the principal amount						100.00%
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				LIBOR
Interest rate margin (as a percent)										2.75%		2.25%	3.00%	2.75%
Option to increase the available additional borrowing capacity								175,000,000
Loss on extinguishment of debt	7,100,000	7,129,000
Amount outstanding														0						43,300,000
Available capacity														156,700,000
Interest rate at period end (as a percent)																				2.88%
Commitment fee on the unused balance (as a percent)																				0.50%
Maturities of long-term debt and obligations under capital leases
2014			20,807,000
2015			27,942,000
2016			30,772,000
2017			99,161,000
2018			1,285,000
Thereafter			200,070,000
Long-term debt and obligations			$ 380,037,000