Income Taxes (Schedule of Deferred Tax Asset (Liability)) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred Tax Assets, Operating Loss Carryforwards	$ 39,000
Deferred tax asset, net	24,822	15,668
Deferred Tax Liabilities, Net, Noncurrent	128,066
Deferred Tax Assets, Net, Noncurrent	(128,066)	(95,275)
Deferred Tax Assets, Net	(88,741)	(79,607)
Current [Member]
Deferred Tax Assets, Operating Loss Carryforwards	9,003	5,130
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits	15,213	13,299
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	286	316
Deferred Tax Assets, Other	5,537	1,280
Deferred Tax Assets, Gross, Current	30,039	20,025
Deferred Tax Assets, Valuation Allowance, Current	596	2,623
Deferred Tax Assets, Net of Valuation Allowance, Current	29,443	17,402
Deferred Tax Liabilities, Other	4,662	1,734
Deferred Tax Liabilities, Net, Current	4,662	1,734
Deferred tax asset, net	24,781	15,668
Noncurrent [Member]
Deferred Tax Assets, Operating Loss Carryforwards	68,042	26,413
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits	20,705	18,713
Deferred tax asset, fixed assets and intangible assets	43,751	0
Deferred Tax Assets Interest Rate Swap Contracts Noncurrent	2,857	3,577
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	10,522	0
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other	9,171	7,281
Deferred Tax Assets, Gross, Noncurrent	155,048	55,984
Deferred Tax Assets, Valuation Allowance, Noncurrent	50,434	7,335
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	104,614	48,649
Deferred Tax Liabilities, Prepaid Expenses	781	825
Deferred tax liability, fixed assets and intangible assets	64,762	8,595
Deferred Tax Liabilities, Investment in Noncontrolled Affiliates	138,790	131,116
Deferred Tax Liabilities, Deferred Expense, Other Capitalized Costs	13,803	3,388
Deferred Tax Liabilities, Net, Noncurrent	218,136	143,924
Deferred Tax Assets, Net, Noncurrent	$ (113,522)	$ (95,275)