Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Cash and cash equivalents	$ 62,082	$ 99,167
Accounts receivable, net	163,117	137,807
Prepaid expenses	11,792	8,728
Inventories	4,414	4,526
Deferred income taxes	146	227
Other	8,506	7,457
Property and equipment, net	260,065	270,757
Goodwill	492,724	469,596
Intangible assets, net	77,830	81,680
Other assets	50,498	35,530
Accounts payable	60,161	57,635
Accrued expenses	101,108	82,609
Income taxes payable	3,621	2,114
Current portion of long-term debt	30,890	26,350
Long-term debt, less current portion	999,679	940,771
Other long-term liabilities	$ 44,694	$ 51,079
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, Stated value (in dollars per share)	$ 1,000	$ 1,000
Preferred stock, shares authorized (in shares)	3,500,000	3,500,000
Preferred stock, shares issued (in shares)	385,000	385,000
Preferred stock, shares outstanding (in shares)	385,000	385,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,000,000	1,000,000
Common stock, shares issued (in shares)	1,028	1,028
Common stock, shares outstanding (in shares)	1,028	1,028
Consolidated VIEs [Member]
Cash and cash equivalents	$ 9,883	$ 7,202
Accounts receivable, net	19,858	13,799
Prepaid expenses	1,028	651
Inventories	318	370
Deferred income taxes	6	6
Other	370	403
Property and equipment, net	23,281	19,051
Goodwill	78,665	54,377
Intangible assets, net	14,024	12,421
Other assets	6,309	6,335
Accounts payable	2,378	1,270
Accrued expenses	3,408	3,534
Income taxes payable	0	0
Current portion of long-term debt	76	14
Long-term debt, less current portion	197	11
Other long-term liabilities	$ 2,769	$ 2,474