Other Noncurrent Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other Non-Current Liabilities [Line Items]
Other	$ 4,542	$ 5,611
Total other noncurrent liabilities	70,397	140,833
Tax amortization benefit contingency
Other Non-Current Liabilities [Line Items]
Tax amortization benefit contingency	65,855	132,724
Deferred acquisition payment
Other Non-Current Liabilities [Line Items]
Deferred payment	$ 0	$ 2,498