Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Line Of Credit Facility [Line Items]
Debt issuance costs	$ 4,966	$ 6,641
Long-term debt	$ 1,557,883	$ 1,553,389
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	94,044,203	93,400,929
Treasury stock, shares	15,790,463	10,174,589
Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Long-term debt	$ 50,000	$ 30,000