Leases - Operating Leases (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Leases [Abstract]
Right of use assets	$ 144,944
Current portion of operating lease liabilities	27,535
Long-term operating lease liabilities	118,167
Total operating lease liabilities	145,702
Cash paid for operating leases	21,475
ROU assets obtained in exchange for lease obligations	$ 9,402
Weighted average remaining lease term	5 years
Weighted average discount rate (percent)	8.25%