Income Taxes - Deferred Tax Assets and Liabilities Classified in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Net current deferred tax liabilities	$ 0	$ 0
Net non-current deferred tax liabilities	(54,641)	(58,529)
Net current deferred tax assets	0	0
Net non-current deferred tax assets	0	0
Net non-current deferred tax liabilities	$ (54,641)	$ (58,529)