Guarantor Financial Information (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed consolidating financial statements
Operating activities	$ 79,303	$ 44,294
Investing activities	(26,713)	(71,442)
Financing activities	(40,000)	35,000
NET INCREASE IN CASH AND CASH EQUIVALENTS	12,590	7,852
Beginning of period	26,623	10,726
End of period	39,213	18,578
Issuer
Condensed consolidating financial statements
Operating activities	53,573	29,404
Investing activities	(18,322)	(64,103)
Financing activities	(20,844)	43,102
NET INCREASE IN CASH AND CASH EQUIVALENTS	14,407	8,403
Beginning of period	19,693	6,030
End of period	34,100	14,433
Guarantor Subsidiaries
Condensed consolidating financial statements
Operating activities	23,309	14,202
Investing activities	(5,910)	(6,651)
Financing activities	(19,232)	(8,102)
NET INCREASE IN CASH AND CASH EQUIVALENTS	(1,833)	(551)
Beginning of period	6,886	4,696
End of period	5,053	4,145
Non-Guarantor Subsidiaries
Condensed consolidating financial statements
Operating activities	1,532	0
Investing activities	(1,592)	0
Financing activities	76	0
NET INCREASE IN CASH AND CASH EQUIVALENTS	16	0
Beginning of period	44	0
End of period	60	0
Adjustments/Eliminations
Condensed consolidating financial statements
Operating activities	889	688
Investing activities	(889)	(688)
Financing activities	0	0
NET INCREASE IN CASH AND CASH EQUIVALENTS	0	0
Beginning of period	0	0
End of period	$ 0	$ 0