CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Interest rate swaps, deferred tax expense	$ 1,500	$ 3,000	$ 1,200	$ 8,300
Capitalized swap interest, deferred tax benefit			$ 100	100
Pension adjustment, tax				$ 350