STOCK-BASED COMPENSATION Stock Option Activity (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	$ 3,625,000	$ 979,000	$ 193,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 13.40	$ 0.00	$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Options Assumed, Weighted Average Grant Date Fair Value	$ 13.50
Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Excluding Options Assumed, Weighted Average Grant Date Fair Value	$ 5.69
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, beginning balance	2,031,177	2,616,915	2,979,767
Gross	16,500	0.00	0.00
Assumed options from business combinations	1,320,290
Exercised	(504,323)	(244,344)	(83,062)
Forfeited/expired	(426,926)	(341,394)	(279,790)
Options outstanding, ending balance	2,436,718	2,031,177	2,616,915
Options outstanding, weighted-average exercise price beginning balance	$ 13.41	$ 15.40	$ 15.35
Granted, weighted-average exercise price	$ 16.64	$ 0.00	$ 0.00
Assumed options from business combinations, weighted-average exercise price	$ 1.92
Exercised, weighted-average exercise price	$ 9.47	$ 9.23	$ 9.22
Forfeited/expired weighted-average exercise price	$ 13.66	$ 31.95	$ 16.73
Options outstanding, weighted-average exercise price ending balance	$ 7.98	$ 13.41	$ 15.40
Options vested at December 31, 2011 and expected to vest after December 31, 2011	2,420,727
Options exercisable at December 31, 2011	1,755,732
Options vested at December 31, 2011 and expected to vest after December 31, 2011, weighted-average exercise price	$ 8.02
Options exercisable at December 31, 2011, weighted-average exercise price	$ 10.11
Options outstanding, weighted-average remaining contractual term	5.32
Options vested at December 31, 2011 and expected to vest after December 31, 2011, weighted-average remaining contractual term	5.30
Options exercisable at December 31, 2011, weighted-average remaining contractual term	4.04
Options outstanding, aggregate intrinsic value	21,103,000
Options vested at December 31, 2011 and expected to vest after December 31, 2011, aggregate intrinsic value	20,885,000
Options exercisable at December 31, 2011, aggregate intrinsic value	11,685,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Weighted Average Remaining Vesting Period	2 years
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 7,457,000	$ 96,000