Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total non-cash stock compensation	$ 4,621	$ 4,854	$ 6,605	$ 8,004
Continuing operations
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total non-cash stock compensation	4,615	4,748	6,596	7,735
Continuing operations | Stock options, net of estimated forfeitures
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total non-cash stock compensation	492	1,340	931	2,163
Continuing operations | Restricted stock awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total non-cash stock compensation	4,123	3,408	5,665	5,572
Discontinued operations
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total non-cash stock compensation	$ 6	$ 106	$ 9	$ 269