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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 159,366 | $ 111,511 | $ 126,452
Other comprehensive income (loss), before tax: |  |  |
Unrealized gains (losses) arising during the period | 2,599 | 1,920 | (20,231)
Amount reclassified from accumulated other comprehensive loss | 180 | 88 | (235)
Total Minimum pension liability | 2,779 | 2,008 | (20,466)
Income tax (expense) benefit related to items of comprehensive income |  | (724) | 3,254
Other comprehensive income (loss), net of tax | 2,779 | 1,284 | (17,212)
Comprehensive income | $ 162,145 | $ 112,795 | $ 109,240

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