Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Net income	$ 213,509	[1]	$ 215,865	[1]	$ 188,715
Other comprehensive income, net of tax:
Unrealized gain on interest rate swaps					2,228
Unrealized gain on marketable securites, available for sale	5
Total comprehensive income	$ 213,514		$ 215,865		$ 190,943

[1] Per share amounts do not add across due to rounding differences in quarterly amounts and due to the impact of differences between the quarterly and annual weighted average share calculations.