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Summary of Significant Accounting Policies - Activity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
Accounting Policies [Abstract] |  |  |  |
Finance Lease, Right-of-Use Asset | $ 38,928 | $ 38,928 | $ 18,948 | $ 18,900
Operating Lease, Right-of-Use Asset | 333,525 | 333,525 | 387,970 | 0
Leases, Right-of-Use Asset |  |  | 406,900 |
Finance Lease, Liability, Current | 5,150 | 5,150 | 728 | 0
Operating Lease, Liability, Current | 44,477 | 44,477 | 48,104 | 0
Finance Lease, Liability, Noncurrent | 36,220 | 36,220 | 19,829 | 0
Operating Lease, Liability, Noncurrent | 299,009 | 299,009 | 350,818 | $ 0
Finance Lease, Right-of-Use Asset, New Leases |  |  | 38 |
Operating Lease, Right-of-Use Asset, New Leases |  |  | 0 |
Finance Lease, Liability, Current, New Leases |  |  | 3 |
Operating Lease, Liability, Current, New Leases |  |  | 89 |
Finance Lease, Liability, Noncurrent, New Leases |  |  | 35 |
Operating Lease, Liability, Noncurrent, New Leases |  |  | 0 |
Finance Lease, Right-of-Use Asset, Modifications |  |  | 21,514 |
Operating Lease, Right-of-Use Asset, Modifications |  |  | (33,710) |
Finance Lease, Liability, Current, Modifications |  |  | 4,552 |
Operating Lease, Liability, Current, Modifications |  |  | (1,615) |
Finance Lease, Liability, Noncurrent, Modifications |  |  | 16,935 |
Operating Lease, Liability, Noncurrent, Modifications |  |  | $ (32,200) |
Finance Lease, Right-of-Use Asset, Amortization | $ (862) | (1,572) |  |
Operating Lease, Right-of-Use Asset, Amortization |  | (20,735) |  |
Finance Lease, Liability, Current, Amortization |  | (133) |  |
Operating Lease, Liability, Current, Amortization |  | (2,101) |  |
Finance Lease, Liability, Noncurrent, Amortization |  | (579) |  |
Operating Lease, Liability, Noncurrent, Amortization |  | $ (19,609) |  |

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