Income Taxes - Significant Components To Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred Tax Assets:
Accrued liabilities	$ 22,107	$ 22,236
Deferred rent	4,426	3,144
Net operating loss carryforwards	69,290	64,718
Federal benefit of unrecognized tax benefits	12,327	14,859
Foreign deferred tax assets and other adjustments	8,698	8,620
Valuation allowance	(60,009)	(40,182)
Deferred Tax Assets	56,839	73,395
Deferred Tax Liabilities:
Other assets, principally due to differences in amortization	(66,254)	(74,782)
Plant and equipment principally due to differences in depreciation	(23,408)	(39,079)
Deferred tax liabilities	(89,662)	(113,861)
Net deferred tax liability	$ (32,823)	$ (40,466)