Long-Term Debt (Schedule Of Company's Long-Term Debt) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2015	Apr. 30, 2015	Dec. 31, 2014	May. 10, 2012	Apr. 20, 2010
Long-Term Debt [Line Items]
Debt and Capital Lease Obligations, Total	$ 1,030,569,000		$ 967,121,000
Less current portion	(30,890,000)		(26,350,000)
Long-term debt, less current portion	999,679,000		940,771,000
Capital Leases Payable [Member]
Long-Term Debt [Line Items]
Debt and Capital Lease Obligations, Total	56,193,000		66,552,000
Senior Secured Term Credit Facility Maturities Through April 30, 2022 [Member]
Long-Term Debt [Line Items]
Debt and Capital Lease Obligations, Total	604,051,000
Face amount	610,000,000
Senior Secured Term Credit Faclitiy Maturities Through October 15, 2016 [Member]
Long-Term Debt [Line Items]
Debt and Capital Lease Obligations, Total			88,704,000
Face amount	90,000,000		90,000,000
Senior Secured Revolving Credit Facility [Member]
Long-Term Debt [Line Items]
Face amount	125,000,000
11.00% Senior Secured Notes May 1, 2023 [Member]
Long-Term Debt [Line Items]
Debt and Capital Lease Obligations, Total	360,000,000
Face amount	$ 360,000,000	$ 360,000,000
Fixed interest rate	11.00%
9 7/8% Senior Subordinated Notes Due April 15, 2017 [Member]
Long-Term Debt [Line Items]
Debt and Capital Lease Obligations, Total			378,407,000
Face amount	$ 380,100,000		380,100,000
Fixed interest rate	9.875%				9.875%
8 7/8% Senior Secured Second Lien Notes due January 15, 2017 [Member]
Long-Term Debt [Line Items]
Debt and Capital Lease Obligations, Total			349,275,000
Face amount	$ 350,000,000		350,000,000
Fixed interest rate	8.875%			8.875%
11 3/4% Senior Secured Due January 15, 2017 [Member]
Long-Term Debt [Line Items]
Debt and Capital Lease Obligations, Total	$ 443,000		75,000,000
Face amount	$ 75,000,000		75,000,000
Fixed interest rate	11.75%
Other Notes Payable Due Through August 2021 [Member]
Long-Term Debt [Line Items]
Debt and Capital Lease Obligations, Total	$ 9,882,000		$ 9,183,000
Interest rate, minimum	9.30%
Interest rate, maximum	19.50%
Minimum [Member] | Capital Leases Payable [Member]
Long-Term Debt [Line Items]
Variable interest rate	1.00%
Maximum [Member] | Capital Leases Payable [Member]
Long-Term Debt [Line Items]
Variable interest rate	19.10%
LIBOR [Member] | Minimum [Member]
Long-Term Debt [Line Items]
Variable interest rate	1.00%
LIBOR [Member] | Minimum [Member] | Senior Secured Term Credit Faclitiy Maturities Through October 15, 2016 [Member]
Long-Term Debt [Line Items]
Variable interest rate	1.00%
LIBOR [Member] | Maximum [Member] | Senior Secured Term Credit Facility Maturities Through April 30, 2022 [Member]
Long-Term Debt [Line Items]
Variable interest rate	5.50%
LIBOR [Member] | Maximum [Member] | Senior Secured Term Credit Faclitiy Maturities Through October 15, 2016 [Member]
Long-Term Debt [Line Items]
Variable interest rate	6.50%
Prime Rate [Member] | Minimum [Member] | Senior Secured Term Credit Facility Maturities Through April 30, 2022 [Member]
Long-Term Debt [Line Items]
Variable interest rate	2.00%
Prime Rate [Member] | Minimum [Member] | Senior Secured Term Credit Faclitiy Maturities Through October 15, 2016 [Member]
Long-Term Debt [Line Items]
Variable interest rate	2.00%
Base Rate [Member] | Maximum [Member] | Senior Secured Term Credit Facility Maturities Through April 30, 2022 [Member]
Long-Term Debt [Line Items]
Variable interest rate	4.50%
Base Rate [Member] | Maximum [Member] | Senior Secured Term Credit Faclitiy Maturities Through October 15, 2016 [Member]
Long-Term Debt [Line Items]
Variable interest rate	5.50%