CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net income	$ 10,964	$ 10,608
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	13,349	10,035
Amortization of discount and deferred debt issuance costs	1,267	1,558
Share-based compensation	2,025
Deferred income taxes, net	624	2,597
Provision for losses on accounts receivable	2,885	3,475
Write down of assets held for sale		1,628
Loss on extinguishment of debt, net of original issue discount paid	6,400
Loss on sale of assets	95	175
Changes in operating assets and liabilities	(16,047)	(1,927)
Cash provided by operating activities	21,562	28,149
Cash flows from investing activities:
Purchases of property and equipment	(7,415)	(5,300)
Acquisitions of businesses, net of cash acquired	(8,662)	(8,645)
Proceeds from sale of assets	43	322
Cash used in investing activities	(16,034)	(13,623)
Cash flows from financing activities:
Long-term debt repayments	(168,866)	(31,424)
Long-term debt borrowings	175,000
Payments on obligations under capital leases	(46)	(46)
Funds contributed by co-investors		1,400
Debt issuance costs	(3,978)	(558)
Cash provided by (used in) financing activities	2,110	(30,628)
Effect of exchange rate changes on cash and cash equivalents	9	81
Increase (decrease) in cash and cash equivalents	7,647	(16,021)
Cash and cash equivalents at beginning of period	25,651	27,552
Cash and cash equivalents at end of period	33,298	11,531
Supplemental schedule of non-cash investing and financing activities:
Notes issued in connection with acquisitions	39	665
Forgiveness of management fees and promissory note in connection with an acquisition		$ 2,328