Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended																					3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member]	Jun. 30, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member]	Jun. 30, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Jun. 30, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2013 Fair Value, Measurements, Recurring [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Estimate of Fair Value Measurement [Member]	Jun. 30, 2013 Interest Rate Swap [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Interest Rate Swap [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Jun. 30, 2013 Interest Rate Swap [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Interest Rate Swap [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2013 Interest Rate Swap [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value Measurement [Member]	Dec. 31, 2012 Interest Rate Swap [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value Measurement [Member]	Jun. 30, 2012 Assets, Discontinued Operations [Member] Fair Value, Measurements, Nonrecurring [Member]	Jun. 30, 2012 Assets, Discontinued Operations [Member] Fair Value, Measurements, Nonrecurring [Member]	Jun. 30, 2013 Property and equipment [Member] Fair Value, Measurements, Nonrecurring [Member]	Jun. 30, 2012 Property and equipment [Member] Fair Value, Measurements, Nonrecurring [Member]	Jun. 30, 2013 Property and equipment [Member] Fair Value, Measurements, Nonrecurring [Member]	Jun. 30, 2012 Property and equipment [Member] Fair Value, Measurements, Nonrecurring [Member]	Jun. 30, 2012 Equity Method Investments [Member] Fair Value, Measurements, Nonrecurring [Member]	Jun. 30, 2012 Equity Method Investments [Member] Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets of Disposal Group, Including Discontinued Operation, Current			$ 791	$ 794		$ 794		$ 0		$ 0
Fair Value, Nonrecurring Basis, Asset, Gain (Loss) Included in Earnings	6,044	21,983																					1,785	15,700	877	3,013	1,721	5,037	1,246	1,246
Equity Method Investments			99,484	94,227		0		0		0
Finite-Lived Intangible Assets, Net			155,724	171,584
Property and equipment, net			181,729	186,617	0	0	0	0	0	0
Financial Assets:
Cash and cash equivalents											176,591	148,858	0	0	176,591	148,858
Restricted cash											0	0	20,025	22,117	20,025	22,117
Equity securities											22,430	22,168	0	0	22,430	22,168
Total Financial Assets					794		0		0		199,021	171,026	20,025	22,117	219,046	193,143
Financial Liabilities:
Total debt											0	0	859,038	899,258	859,038	899,258
Total Financial Liabilities											0	0	859,038	899,258	859,038	899,258
Derivative Assets																	0		4,469
Interest rate swap agreements																		$ 0		$ (6,486)	$ 4,469	$ 6,486