Leases - Restated (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Total assets	$ 1,702,889	$ 1,742,433	$ 1,639,782
Total current liabilities	417,622	458,026	432,722
Total long-term liabilities	$ 1,907,153	1,900,491	$ 1,820,788
ASU 2016-02 | Adjustment
Lessee, Lease, Description [Line Items]
Total assets		102,651
Total current liabilities		25,304
Total long-term liabilities		$ 79,703