Leases - Other Lease Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Lessee
Operating cash flows from finance leases			$ 4,817	$ 10,302
Operating cash flows from operating leases			2,602
Financing cash flows from finance leases			2,658	4,647
Right-of-use assets obtained in exchange for new operating lease liabilities			6,983
Finance Leases
2019	$ 7,475		7,475
2020	14,949		14,949
2021	14,949		14,949
2022	14,949		14,949
2023	14,949		14,949
Thereafter	70,481		70,481
Total lease payments	137,752		137,752
Less: imputed interest	(53,218)		(53,218)
Total finance lease liabilities	84,534		84,534		$ 87,192
Operating Leases
2019	1,109		1,109
2020	1,402		1,402
2021	798		798
2022	608		608
2023	386		386
Thereafter	1,157		1,157
Total lease payments	5,460		5,460
Less: imputed interest	(897)		(897)
Total operating lease liabilities	4,563		4,563
Total finance and operating lease liabilities
2019	8,584		8,584
2020	16,351		16,351
2021	15,747		15,747
2022	15,557		15,557
2023	15,335		15,335
Thereafter	71,638		71,638
Total lease payments	143,212		143,212
Less: imputed interest	(54,115)		(54,115)
Present value of lease liabilities	89,097		89,097
Lessor
Lease income	$ 1,514	$ 1,461	$ 4,554	$ 4,406