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Summary of Significant Accounting Policies - Activity (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
Accounting Policies [Abstract] |  |  |  |
Finance Lease, Right-of-Use Asset | $ 35,322 | $ 35,322 | $ 18,948 | $ 18,900
Operating Lease, Right-of-Use Asset | 328,850 | 328,850 | 387,970 | 0
Leases, Right-of-Use Asset |  |  | 406,900 |
Finance Lease, Liability, Current | 1,515 | 1,515 | 728 | 0
Operating Lease, Liability, Current | 43,692 | 43,692 | 48,104 | 0
Finance Lease, Liability, Noncurrent | 36,646 | 36,646 | 19,829 | 0
Operating Lease, Liability, Noncurrent | 295,005 | 295,005 | 350,818 | $ 0
Finance Lease, Right-of-Use Asset, New Leases |  |  | 38 |
Operating Lease, Right-of-Use Asset, New Leases |  |  | 754 |
Finance Lease, Liability, Current, New Leases |  |  | 3 |
Operating Lease, Liability, Current, New Leases |  |  | 521 |
Finance Lease, Liability, Noncurrent, New Leases |  |  | 36 |
Operating Lease, Liability, Noncurrent, New Leases |  |  | 233 |
Finance Lease, Right-of-Use Asset, Modifications |  |  | 18,782 |
Operating Lease, Right-of-Use Asset, Modifications |  |  | (25,910) |
Finance Lease, Liability, Current, Modifications |  |  | 4,521 |
Operating Lease, Liability, Current, Modifications |  |  | (1,829) |
Finance Lease, Liability, Noncurrent, Modifications |  |  | 17,750 |
Operating Lease, Liability, Noncurrent, Modifications |  |  | $ (23,914) |
Finance Lease, Right-of-Use Asset, Amortization | $ (874) | (2,446) |  |
Operating Lease, Right-of-Use Asset, Amortization |  | (33,964) |  |
Finance Lease, Liability, Current, Amortization |  | (3,737) |  |
Operating Lease, Liability, Current, Amortization |  | (3,104) |  |
Finance Lease, Liability, Noncurrent, Amortization |  | (969) |  |
Operating Lease, Liability, Noncurrent, Amortization |  | $ (32,132) |  |

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