Share-Based Compensation - Summary of Share-Based Compensation (income) expense (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Summary of share-based compensation expense
Share-based compensation (income) expense before income tax expense (benefit)		$ (2,145)	$ 2,206
Income tax benefit		(109)	(558)
Share-based compensation (income) expense, net of income tax benefit		(2,254)	1,648
Performance Unit Incentive Plan ("PUP")
Summary of share-based compensation expense
Share-based compensation (income) expense before income tax expense (benefit)	[1]	(2,635)	1,423
Restricted stock
Summary of share-based compensation expense
Share-based compensation (income) expense before income tax expense (benefit)		650	693
Restricted stock units
Summary of share-based compensation expense
Share-based compensation (income) expense before income tax expense (benefit)		$ (160)	$ 90

[1] ^{PUP awards are liability-based awards that are tied to our stock price and the expected achievement of certain performance-based criteria. During the three months ended March 31, 2020, the value of the PUP awards decreased due to the reduction of our estimated performance achievement and the decline in our stock price as a result of COVID-19.}