Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended					9 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 03, 2020	Jul. 28, 2020	Feb. 20, 2020	Feb. 21, 2019	Dec. 01, 2017	May 18, 2017	Jun. 02, 2016
Equity, Class of Treasury Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.01					$ 0.01		$ 0.01
Reduction to additional paid in capital		$ 46,133,000	$ 82,866,000	$ 51,053,000	$ 50,311,000
Reduction in retained earnings	$ (1,659,947,000)					$ (1,659,947,000)		$ (1,506,271,000)
Common stock, shares outstanding (in shares)	34,295					34,295		34,481
Additional Paid-in Capital
Equity, Class of Treasury Stock [Line Items]
Reduction to additional paid in capital		$ 3,047,000	82,859,000	$ 51,048,000	$ 50,306,000	$ 3,000,000
2016 Stock Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program authorized amount	$ 900,000,000					900,000,000									$ 100,000,000
Stock repurchase program additional amount authorized									$ 200,000,000	$ 200,000,000	$ 100,000,000	$ 100,000,000	$ 100,000,000	$ 100,000,000
Available amount under repurchase program	167,100,000					167,100,000
Reduction to additional paid in capital	0		$ 82,852,000			46,124,000	$ 184,196,000
Reduction in retained earnings	$ 43,100,000					$ 43,100,000