Stockholders' Deficit - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands														12 Months Ended
	Feb. 19, 2020	Oct. 04, 2019	Jul. 12, 2019	Apr. 05, 2019	Jan. 04, 2019	Oct. 05, 2018	Jul. 06, 2018	Apr. 06, 2018	Jan. 05, 2018	Oct. 06, 2017	Jul. 07, 2017	Apr. 07, 2017	Jan. 06, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Feb. 20, 2019	Oct. 01, 2015
Class of Stock [Line Items]
Authorized amount																	$ 200,000
Dividends paid per common share (in dollars per share)		$ 0.69	$ 0.69	$ 0.69	$ 0.63	$ 0.63	$ 0.63	$ 0.63	$ 0.97	$ 0.97	$ 0.97	$ 0.97	$ 0.97	$ 2.70	$ 2.86	$ 3.88
Reissuance of treasury stock (in shares)														(285,302)	(167,396)	(281,185)
Reissuance of treasury stock														$ 11,969	$ 3,928	$ 2,635
Treasury Stock
Class of Stock [Line Items]
Reissuance of treasury stock (in shares)														(285,000)	(167,000)	(281,000)
Reissuance of treasury stock														$ 12,490	$ 6,479	$ 10,113
Subsequent Event
Class of Stock [Line Items]
Dividends paid per common share (in dollars per share)	$ 0.76
2015 Authorization
Class of Stock [Line Items]
Authorized amount																		$ 150,000