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Stock-Based Compensation - Deferred Compensation Plan (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
SERP expense | $ 3,659 | $ 3,095
SERP |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
SERP expense | 346 | 328
Unrealized gain recorded in SERP liability account | $ 4,939 | $ 1,118

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