Share-Based Compensation - Narrative (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2020 USD ($) age	Mar. 31, 2020	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Restricted Stock Units (RSUs)
Restricted stock units under the long-term Incentive Plans [Abstract]
Vesting period	5 years
Retirement age | age	65
Vesting period for awards granted in 2017 and 2018	3 years
Vesting period for awards granted in 2019 and thereafter				3 years
Awards granted for time based vesting percentage				50.00%
Grant date fair value of restricted stock units granted				$ 3,200	$ 2,100
Anticipated additional compensation costs to be recognized in future period	$ 6,100			6,100
Share-based Payment Arrangement, Expense	1,600		$ 500	$ 2,500	$ 1,400
Restricted Stock Units (RSUs) | Non-Employee Directors Compensation Plan
Restricted stock units under the long-term Incentive Plans [Abstract]
Vesting period				1 year
Anticipated additional compensation costs to be recognized in future period	$ 1,000			$ 1,000
Performance Shares
Restricted stock units under the long-term Incentive Plans [Abstract]
Award granted for target based performance percentage				50.00%
Performance Shares | Minimum
Restricted stock units under the long-term Incentive Plans [Abstract]
Actual shares vesting percentage	0.00%
Performance Shares | Maximum
Restricted stock units under the long-term Incentive Plans [Abstract]
Actual shares vesting percentage				200.00%
Combination of RSUs and Performance Stock Units ("PSUs") [Member]
Restricted stock units under the long-term Incentive Plans [Abstract]
Performance target period for incentive plan modified to award		3 years