Share-Based Compensation - Stock Options Outstanding and Exercisable (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Options Outstanding
Total Options Outstanding (in shares) | shares	2,105
Options Exercisable
Number Exercisable (in shares) | shares	2,105
Aggregate Intrinsic Value
Options Outstanding (in dollars) | $	$ 1,965
Options Exercisable (in dollars) | $	$ 1,965
$10.00-$10.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit (in dollars per share)	$ 10
Range of Exercise Prices, Upper Limit (in dollars per share)	$ 10
Options Outstanding
Total Options Outstanding (in shares) | shares	10
Weighted Average Remaining Life (Years)	3 months 18 days
Weighted Average Exercise Price (in dollars per share)	$ 10.00
Options Exercisable
Number Exercisable (in shares) | shares	10
Weighted Average Exercise Price (in dollars per share)	$ 10.00
$13.46-$22.35
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit (in dollars per share)	13.46
Range of Exercise Prices, Upper Limit (in dollars per share)	$ 22.35
Options Outstanding
Total Options Outstanding (in shares) | shares	2,095
Weighted Average Remaining Life (Years)	8 months 12 days
Weighted Average Exercise Price (in dollars per share)	$ 13.48
Options Exercisable
Number Exercisable (in shares) | shares	2,095
Weighted Average Exercise Price (in dollars per share)	$ 13.48