Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Other Comprehensive Income [Abstract]
NET INCOME	$ 31,303	$ 22,118
Other comprehensive income (loss), net of taxes:
Foreign currency translation adjustment	8,215	(7,456)
Net unrealized gain (loss) on interest rate swaps:
Unrealized loss arising during the period, net of tax benefit of $1,512 and $8, respectively	(2,520)	(14)
Reclassification adjustment for loss included in interest expense, net of tax provision of $1,044 and $1,025, respectively	1,740	1,708
Net unrealized (loss) gain on interest rate swaps, net of tax	(780)	1,694
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAXES	7,435	(5,762)
COMPREHENSIVE INCOME	$ 38,738	$ 16,356