Leases - Maturities of Operating and Finance Lease Liabilities (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Operating Leases
2019, excluding amounts already paid	$ 7,501
2020	13,821
2021	13,612
2022	12,471
2023	10,055
Thereafter	20,697
Total future lease payments	78,157
Less: amount representing interest	13,879
Total operating lease liabilities	64,278
Finance Leases
2019, excluding amounts already paid	3,654
2020	7,450
2021	7,597
2022	7,747
2023	7,901
Thereafter	21,838
Total future lease payments	56,187
Less: amount representing interest	16,623
Total finance lease liabilities	$ 39,564