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Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2019 | Jan. 01, 2019
RECENT ACCOUNTING STANDARDS |  |  |
Operating Lease, Liability |  | $ 39,003 |
Operating Lease, Right-of-Use Asset |  | 33,850 |
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect |  | (2,732) |
ASU No. 2018-02, Leases (Topic 842) |  |  |
RECENT ACCOUNTING STANDARDS |  |  |
Operating Lease, Liability |  | $ 39,003 |
ASU No. 2018-02, Leases (Topic 842) | Restatement Adjustment |  |  |
RECENT ACCOUNTING STANDARDS |  |  |
Operating Lease, Liability |  |  | $ 44,000
Operating Lease, Right-of-Use Asset |  |  | $ 44,000
ASU No. 2018-02, (Topic 220) |  |  |
RECENT ACCOUNTING STANDARDS |  |  |
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect | $ 2,700 |  |

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