Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 24,024	$ 36,281	$ 98,825	$ 125,075
Accumulated losses on derivatives reclassified to derivative interest expense	0	69	0	3,886
Other	0	0	(81)	0
Other comprehensive income (loss) before income taxes	0	69	(81)	3,886
Income tax effect of items within other comprehensive income (loss)	0	0	0	(1,469)
Other comprehensive income (loss), net of income taxes	0	69	(81)	2,417
Total comprehensive income	$ 24,024	$ 36,350	$ 98,744	$ 127,492