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Adoption of Accounting Pronouncements(Other Information) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Other assets | $ 113,534 | $ 78,339 |
Total Assets | 7,355,848 | 6,904,433 |
Long-term debt | 438,667 | 328,192 |
Liabilities | 5,824,478 | 5,506,392 |
Total Liabilities and Stockholders' Equity | 7,355,848 | 6,904,433 |
Interest expense | 22,771 | 22,428 | $ 23,063
Other expenses | $ 42,989 | $ 38,371 | 32,696
Restatement Adjustment [Member] |  |  |
Interest expense |  |  | 23,063
Other expenses |  |  | 32,696
Scenario, Previously Reported [Member] |  |  |
Interest expense |  |  | 22,086
Other expenses |  |  | $ 33,673

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