Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 17,916	$ 6,011	$ 23,298	$ 9,974
Defined benefit plans:
Reclassification adjustment for losses included in net income (Pension termination)	2,519	0	2,519	0
Forward starting interest rate swaps:
Losses arising during the periods	(961)	0	(1,684)	0
Reclassification adjustment for losses included in net income (Interest expense)	31	0	31	0
Total other comprehensive income	19,505	6,011	24,164	9,974
Less: comprehensive income attributable to noncontrolling interests	0	(40)	0	(151)
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	$ 19,505	$ 5,971	$ 24,164	$ 9,823