Stock-Based Compensation - Narratives (Details) - USD ($)		12 Months Ended			17 Months Ended
	Dec. 14, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2017	Apr. 30, 2020	Oct. 03, 2017	May 04, 2016
Share-based Compensation Arrangement by Share-based Payment Award
Dividends paid on common stock (in dollars per share)	$ 1.80	$ 1.80
Additional stock compensation expense		$ 2,144,000
Proceeds from stock options exercised		373,000	$ 3,975,000	$ 131,000
Stock compensation expense		21,527,000	16,212,000	18,419,000
Stock compensation expense, tax benefit		$ 5,664,000	3,543,000	4,671,000
Discontinued Operations
Share-based Compensation Arrangement by Share-based Payment Award
Dividends paid on common stock (in dollars per share)		$ 1.80
Additional stock compensation expense		$ 654,000
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award
Expiration period		10 years
Intrinsic value of stock options exercised		$ 3,615,000
Proceeds from stock options exercised		3,975,000
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Unrecognized stock-based compensation expense, other than options		$ 20,511,000
Unrecognized stock-based compensation expense, period for recognition		1 year 7 months 2 days
Fair value of awards vested		$ 11,269,000	8,493,000	13,628,000
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Award requisite service period		3 years
Unrecognized stock-based compensation expense, other than options		$ 10,982,000
Unrecognized stock-based compensation expense, period for recognition		1 year 7 months 17 days
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award
Stock compensation expense		$ 0
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award
Fair value of awards vested		$ 510,000	$ 1,543,000	$ 3,493,000
Board of Directors | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period		1 year
Employee | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period		3 years
Exit event exceeding threshold | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting percentage		100.00%
2016 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares authorized (shares)								8,017,038
Share awards issued (shares)					7,644,518
2017 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares reserved for issuance (shares)							7,344,000
Number of shares available for grant (shares)		12,405,315				9,000,000	372,520
Minimum | Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting percentage		0.00%
Maximum | Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting percentage		200.00%