CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income	$ 23,240	$ 40,898
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	20,010	14,219
Amortization of discount and deferred debt issuance costs	2,091	2,256
Share-based compensation	2,945
Deferred income taxes, net	1,622	4,272
Provision for losses on accounts receivable	4,237	4,962
Write down of assets held for sale		1,642
Loss on extinguishment of debt, net of original issue discount paid	6,400
Loss on sale of assets	76	378
Changes in operating assets and liabilities	(22,807)	(25,252)
Cash provided by operating activities	37,814	43,375
Cash flows from investing activities:
Purchases of property and equipment	(11,324)	(9,133)
Acquisitions of businesses, net of cash acquired	(22,077)	(17,803)
Proceeds from sale of assets	80	217
Cash used in investing activities	(33,321)	(26,719)
Cash flows from financing activities:
Long-term debt repayments	(172,077)	(33,176)
Long-term debt borrowings	175,000
Payments on obligations under capital leases	(69)	(70)
Funds contributed by co-investors		1,400
Debt issuance costs	(4,007)	(561)
Cash used in financing activities	(1,153)	(32,407)
Effect of exchange rate changes on cash and cash equivalents	93	(137)
Increase (decrease) in cash and cash equivalents	3,433	(15,888)
Cash and cash equivalents at beginning of period	25,651	27,552
Cash and cash equivalents at end of period	29,084	11,664
Supplemental schedule of non-cash investing and financing activities:
Notes issued in connection with acquisitions	739	1,282
Forgiveness of management fees and promissory note in connection with an acquisition		$ 2,718