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Recently Issued Accounting Standards - Balance Sheet (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Prepaid and other current assets | $ 1,300 | $ 1,308 | $ 1,456
Operating lease right-of-use assets | 23,485 | 16,470 | 0
Assets | 957,388 |  | 917,502
Other Liabilities |  | 22,370 | 22,644
Other long-term liabilities | 1,920 | 2,441 | 3,133
Current portion of operating lease obligations | 1,541 | 2,633 | 0
Obligations under operating leases, net of current portion | 22,673 | 14,655 | 0
Liabilities | $ 732,828 |  | $ 696,010
Accounting Standards Update 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Prepaid and other current assets |  | (148) |
Operating lease right-of-use assets |  | 16,470 |
Assets |  | 16,322 |
Other Liabilities |  | (274) |
Other long-term liabilities |  | (692) |
Current portion of operating lease obligations |  | 2,633 |
Obligations under operating leases, net of current portion |  | 14,655 |
Liabilities |  | $ 16,322 |

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