Leases - Balance Sheet Location (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Leases
Operating lease right-of-use assets, net	$ 93,627	$ 93,352	$ 96,498	$ 100,727
Current portion of operating lease liabilities	25,345	26,604	27,444	27,368
Operating lease liabilities, net of current portion	73,282	71,661	74,290	78,290
Finance Lease
Finance lease right-of-use asset, net	$ 30,835
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	US_GAAP:PropertyPlantAndEquipment
Current portion of finance lease liabilities	$ 13,788	15,172	15,897	15,961	$ 15,926	$ 16,568	$ 14,785
Finance lease liabilities, net of current portion	$ 20,272	$ 24,159	$ 25,772	$ 27,231	$ 22,945	$ 25,193	$ 26,474