CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (Details) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Condensed Financial Information [Line Items]
Net cash (used) provided by operating activities	$ 189,683,000	$ 71,828,000
Investing Activities:
Capital expenditures	(19,469,000)	(23,966,000)
Acquisition payments	(201,123,000)	(8,166,000)
Other	51,000	86,000
Net cash used in investing activities	(220,541,000)	(32,046,000)
Financing Activities:
Net borrowings (repayments)	66,805,000	(1,029,000)
Equity transactions	(2,469,000)	(2,517,000)
Other	10,055,000	8,751,000
Net cash (used in) provided by financing activities	74,391,000	5,205,000
Effect of exchange rate changes on cash and cash equivalents	235,000	(4,515,000)
Net change in cash and cash equivalents	43,768,000	40,472,000
Cash and cash equivalents at the beginning of the period	63,869,000	53,577,000
Cash and cash equivalents at the end of the period	107,637,000
Parent Company [Member]
Condensed Financial Information [Line Items]
Net cash (used) provided by operating activities	(8,490,000)	(2,450,000)
Investing Activities:
Capital expenditures	0	0
Acquisition payments	0	0
Other	0	0
Net cash used in investing activities	0	0
Financing Activities:
Net borrowings (repayments)	10,957,000	4,973,000
Equity transactions	(2,469,000)	(2,517,000)
Other	0	0
Net cash (used in) provided by financing activities	8,488,000	2,456,000
Effect of exchange rate changes on cash and cash equivalents	0	0
Net change in cash and cash equivalents	(2,400)	6,000
Cash and cash equivalents at the beginning of the period	5,000	1,000
Cash and cash equivalents at the end of the period	3,000
Guarantor Subsidiaries [Member]
Condensed Financial Information [Line Items]
Net cash (used) provided by operating activities	201,343,000	33,256,000
Investing Activities:
Capital expenditures	(15,654,000)	(21,700,000)
Acquisition payments	(201,123,000)	(8,166,000)
Other	51,000	86,000
Net cash used in investing activities	(216,726,000)	(29,780,000)
Financing Activities:
Net borrowings (repayments)	36,589,000	(6,002,000)
Equity transactions	0	0
Other	10,055,000	8,751,000
Net cash (used in) provided by financing activities	46,644,000	2,749,000
Effect of exchange rate changes on cash and cash equivalents	0	0
Net change in cash and cash equivalents	31,261,000	6,225,000
Cash and cash equivalents at the beginning of the period	44,412,000	32,342,000
Cash and cash equivalents at the end of the period	75,673,000
Non-Guarantor Subsidiaries [Member]
Condensed Financial Information [Line Items]
Net cash (used) provided by operating activities	(3,170,000)	41,022,000
Investing Activities:
Capital expenditures	(3,815,000)	(2,266,000)
Acquisition payments	0	0
Other	0	0
Net cash used in investing activities	(3,815,000)	(2,266,000)
Financing Activities:
Net borrowings (repayments)	19,259,000	0
Equity transactions	0	0
Other	0	0
Net cash (used in) provided by financing activities	19,259,000	0
Effect of exchange rate changes on cash and cash equivalents	235,000	(4,515,000)
Net change in cash and cash equivalents	12,509,000	34,241,000
Cash and cash equivalents at the beginning of the period	19,452,000	21,234,000
Cash and cash equivalents at the end of the period	31,961,000
Consolidation, Eliminations [Member]
Condensed Financial Information [Line Items]
Net cash (used) provided by operating activities	0	0
Investing Activities:
Capital expenditures	0	0
Acquisition payments	0	0
Other	0	0
Net cash used in investing activities	0	0
Financing Activities:
Net borrowings (repayments)	0	0
Equity transactions	0	0
Other	0	0
Net cash (used in) provided by financing activities	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Net change in cash and cash equivalents	0	0
Cash and cash equivalents at the beginning of the period	0	0
Cash and cash equivalents at the end of the period	$ 0