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Share-Based Compensation - Summary of Information Of SERP (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
SERP expense | $ 5,985 | $ 4,252 | $ 3,541
SERP |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
SERP expense | $ 503 | $ 511 | $ 538
Treasury shares issued to fund SERP expense (in shares) | 9 | 13 | 15
SERP trust account balance at December 31 | $ 42,467 | $ 34,599 | $ 37,765
Unrealized gain (loss) recorded in SERP liability account | $ 4,534 | $ 1,495 | $ (62)

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