Lease Obligations - Reconciliation of Lease Liabilities (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Operating Lease Liabilities, Payments Due [Abstract]
2019 remaining	$ 1,733
2020	2,545
2021	2,334
2022	2,318
2023	2,283
2024	2,115
Thereafter	97,187
Total	110,515
Lease liabilities	42,425
Undiscounted excess amount	68,090
Finance Lease Liabilities, Payments, Due [Abstract]
2019 remaining	1,302
2020	1,744
2020	1,751
2022	1,759
2023	23,037
Total	29,593
Lease liabilities	21,875
Undiscounted excess amount	$ 7,718