Lease Obligations - Reconciliation of Lease Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Operating Lease Liabilities, Payments Due [Abstract]
2019 remaining	$ 1,214
2020	2,623
2021	2,414
2022	2,401
2023	2,367
2024	2,165
Thereafter	97,187
Total	110,371
Lease liabilities	42,748
Undiscounted excess amount	67,623
Finance Lease Liabilities, Payments, Due [Abstract]
2019 remaining	869
2020	1,744
2021	1,751
2022	1,759
2023	23,037
Total	29,160
Finance lease obligations	21,851	$ 21,900
Undiscounted excess amount	$ 7,309