Income Taxes (Schedule of Net Current and Long-Term Deferred Tax Balances) (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Deferred Tax Liabilities, Net [Abstract]
Current deferred tax assets, net	$ 31,700				$ 16,300
Long-term deferred tax liabilities, net	203,476	$ 180,449	$ 186,538	$ 154,151	154,763
Net deferred tax liabilities	$ (171,800)				$ (138,500)