Stockholders' Deficit - Narrative (Details) - USD ($)			3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 03, 2020	Jan. 10, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Feb. 20, 2019
Equity, Class of Treasury Stock [Line Items]
Dividends paid on common stock					$ 23,934,000	$ 23,346,000
Dividends declared per common share (USD per share)			$ 0	$ 0.69	$ 0.76	$ 1.38	$ 0.69
Dividends payable			$ 0		$ 0		$ 11,702,000
Dividends paid per common share (USD per share)	$ 0.76	$ 0.69	$ 0.76	$ 0.69	$ 1.45	$ 1.32
Treasury stock reissued (shares)					380,607
Reissuance of treasury stock			$ (1,000)	$ 170,000	$ 20,523,000	$ 6,938,000
Treasury Stock
Equity, Class of Treasury Stock [Line Items]
Treasury stock reissued (shares)			13,000	19,000	381,000	187,000
Reissuance of treasury stock			$ 599,000	$ 822,000	$ 17,156,000	$ 8,257,000
2019 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount								$ 200,000,000