Leases - Other Lease Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Lessee
Operating cash flows from operating leases	$ 772
Right-of-use assets obtained in exchange for new operating lease liabilities	6,983
Finance Leases
2019	14,949
2020	14,949
2021	14,949
2022	14,949
2023	14,949
Thereafter	70,483
Total lease payments	145,228
Less: imputed interest	(58,036)
Present value of lease liabilities	87,192
Operating Leases
2019	2,958
2020	1,413
2021	798
2022	608
2023	386
Thereafter	1,156
Total lease payments	7,319
Less: imputed interest	(1,035)
Present value of lease liabilities	6,284
Total finance and operating lease liabilities
2019	17,907
2020	16,362
2021	15,747
2022	15,557
2023	15,335
Thereafter	71,639
Total lease payments	152,547
Less: imputed interest	(59,071)
Present value of lease liabilities	93,476
Lessor
Lease income	$ 1,518	$ 1,473