Income Taxes (Reconciliation of Net Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred Income Taxes and Tax Credits [Abstract]
Deferred tax assets - current	$ 64,733	$ 59,203
Deferred tax liabilities - current	(84,955)	(78,675)
Deferred tax liabilities - current	(20,222)	(19,472)
Deferred tax assets - noncurrent	65,689	66,015
Deferred tax liabilities - noncurrent	(146,402)	(145,559)
Deferred tax liabilities - noncurrent	(80,713)	(79,544)
Net deferred tax liabilities	$ (100,935)	$ (99,016)