CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Comprehensive income (loss), net of tax:
Net income	$ 7,996	$ 156,212	$ 158,731	$ 100,838
Other comprehensive income (loss):
Interest rate swaps (a)	497	(411)	(14,876)	297
Capitalized swap interest expense (b)	154	(42)	(163)	(154)
Pension adjustment (c)	(317)		(890)
Other comprehensive income (loss)	334	(453)	(15,929)	143
Comprehensive income	8,330	155,759	142,802	100,981
Comprehensive (income) loss attributable to noncontrolling interests	(23)	12	(23)
Comprehensive income attributable to common stockholders	$ 8,307	$ 155,771	$ 142,779	$ 100,981