Income Taxes Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current Federal Tax Provision	$ 12,003	$ 15,647	$ 6,571
Current State Tax Provision	8,181	7,134	6,031
Deferred Federal Income Tax Provision	41,975	49,799	62
Deferred State Income Tax Provision	5,383	8,727	4,890
Current Foreign Tax Provision	11,031	17,591	22,697
Deferred Foreign Income Tax Provision	(2,679)	8,209	6,045
Foreign Income Tax Provision	8,352	25,800	28,742
Provision for income taxes	75,894	107,107	46,296
United States [Member]
Federal Income Tax Expense (Benefit), Continuing Operations	$ 67,542	$ 81,307	$ 17,554