STOCKHOLDERS' EQUITY Changes in Accumulated Other Compehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Equity [Abstract]
Balance at the beginning of period	$ 6,310		$ (19,492)		$ (18,048)		$ (15,368)
Derivative instruments
Reclassification of gain relating to interest rate cash flow hedges from AOCI (net of tax of $71 and $9 for the three months ended September 30, 2013 and 2012, respectively, and net of tax of $90 and $21 for the nine months ended September 30, 2013 and 2012, respectively)	110	[1]	15	[1]	139	[1]	52	[1]
Gain (loss) on interest rate swaps relating to interest rate cash flow hedges (net of tax of $862 for the three months ended September 30, 2012 and net of tax of $15,652 and $3,545 for the nine months ended September 30, 2013 and 2012, respectively)	0		(1,331)		24,329		(5,492)
Derivative instruments, net of tax	110		(1,316)		24,468		(5,440)
Available-for-sale securities
Unrealized gain on available-for-sale securities (net of tax of $56 for the three and nine months ended September 30, 2013)	87		0		87		0
Available-for-sale securities, net of tax	87		0		87		0
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	197		(1,316)		24,555		(5,440)
Balance at the end of period	6,507		(20,808)		6,507		(20,808)
Parenthetical Disclosures
Reclassification of gain relating to interest rate cash flow hedges from AOCI, tax	71		9		90		21
Gain (loss) on interest rate swaps relating to interest rate cash flow hedges, tax			862		15,625		3,545
Unrealized gain on available-for-sale securities, tax	$ 56				$ 56

[1] Reclassified from AOCI to interest expense — net.