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Share-Based Compensation - Summary Of Information Of SERP (Details) - SERP - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended | 72 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amount of company match expensed under SERP | $ 538 | $ 497 | $ 538 |
Treasury shares issued to fund SERP expense | 15 | 16 | 19 | 591
SERP trust account balance at December 31 | $ 37,765 | $ 35,310 | $ 31,415 |
Unrealized gain (loss) recorded in SERP liability account | $ (62) | $ 1,211 | $ 3,005 |

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