Income Taxes Deferred Tax Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Abstract]
Net deferred tax assets	$ 16,662	$ 14,767
Deferred Tax Liabilities, Noncurrent	(112,118)	(101,605)
Deferred Tax Liabilities, Net	$ (95,456)	$ (86,838)