Stockholders' Equity - Share Repurchases Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended									12 Months Ended
	Sep. 30, 2019	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Nov. 01, 2018	Nov. 30, 2017	Nov. 17, 2017
Class of Stock [Line Items]
Stock repurchased	$ 124,500,000										$ 176,985,000	$ 134,647,000	$ 10,301,000
Stock repurchased (in shares)	2,094,196	425,078	50,721	0	532,412	916,083	0	722,941	2,807,393	586,231	6,040,859	5,032,648	586,231
Remaining number of shares authorized to be repurchased (in shares)		0									0
Authorized repurchase amount														$ 200,000,000	$ 100,000,000	$ 100,000,000
Common Stock
Class of Stock [Line Items]
Stock repurchased											$ 3,000	$ 4,000	$ 1,000
Stock repurchased (in shares)											3,102,407	4,446,417	586,231