STOCKHOLDERS' EQUITY, Share-based Compensation Arrangements (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended										0 Months Ended
	Mar. 31, 2013 Price Range 4.30 to 5.80 [Member]	Mar. 31, 2013 Price Range 6.00 to 9.72 [Member]	Mar. 31, 2013 Price Range 9.93 to 14.49 [Member]	Mar. 31, 2013 Price Range 14.50 to 33.50 [Member]	Mar. 31, 2013 Price Range 4.30 to 33.50 [Member]	Mar. 31, 2013 Restricted Stock [Member]	Mar. 31, 2012 Restricted Stock [Member]	Mar. 31, 2013 Stock Options [Member]	Mar. 31, 2012 Stock Options [Member]	Mar. 31, 2013 2007 Equity Incentive Plan [Member]	Jan. 09, 2013 2007 Equity Incentive Plan [Member] Vineyard [Member]
Stock Incentive Plans [Abstract]
Number of shares available for future grant under the plan (in shares)										359,210
Options granted to purchase common stock (in shares)								467,000	65,000		412,000
Options [Abstract]
Outstanding at the beginning of the year (in shares)								1,332,000	1,198,000
Granted (in shares)								467,000	65,000		412,000
Exercised (in shares)								(13,000)	(78,000)
Cancelled (in shares)								(52,000)	(24,000)
Outstanding at the end of the year (in shares)								1,734,000	1,161,000
Vested and expected to vest at the end of the year (in shares)								1,590,000	1,114,000
Exercisable at the end of the year (in shares)								631,000	689,000
Weighted Average Exercise Price [Abstract]
Outstanding at the beginning of the year (in dollars per share)								$ 14.65	$ 10.35
Granted (in dollars per share)								$ 17.22	$ 19.16
Exercised (in dollars per share)								$ 7.85	$ 10.36
Cancelled (in dollars per share)								$ 19.33	$ 11.39
Outstanding at the end of the period (in dollars per share)								$ 15.55	$ 10.87
Vested and expected to vest at the end of the year (in dollars per share)								$ 15.30	$ 10.79
Exercisable at the end of the year (in dollars per share)								$ 11.76	$ 10.42
Aggregate intrinsic value of options outstanding								$ 2.2
Aggregate intrinsic value of options vested and expected to vest								2.2
Aggregate intrinsic value of options exercisable								1.7
Weighted average remaining contractual term, options outstanding								8 years 5 months 5 days
Weighted average remaining contractual term, expected to vest								8 years 3 months 29 days
Weighted average remaining contractual term, options exercisable								6 years 8 months 1 day
Intrinsic value of options exercised during the period								0.1	0.7
Awards [Abstract]
Outstanding at the beginning of the year (in shares)						253,000	136,000
Granted (in shares)						7,000	3,000
Vested (in shares)						(6,000)	(10,000)
Outstanding at the end of the year (in shares)						254,000	129,000
Weighted Average Grant Date Fair Value [Abstract]
Outstanding at the beginning of the year (in dollars per share)						$ 15.79	$ 9.24
Granted (in dollars per share)						$ 13.27	$ 15.64
Vested (in dollars per share)						$ 19.40	$ 6.40
Outstanding at the end of the year (in dollars per share)						$ 15.64	$ 9.61
Weighted-average remaining contractual term, restricted stock awards outstanding						2 years 11 months 26 days
Aggregate pre-tax intrinsic value of RSAs outstanding						$ 2.8
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit	$ 4.30	$ 6.00	$ 9.93	$ 14.50	$ 4.30
Exercise price range, upper limit	$ 5.80	$ 9.72	$ 14.49	$ 33.50	$ 33.50
Options, outstanding and exercisable at end of period [Abstract]
Outstanding options (in shares)	223,000	152,000	245,000	1,114,000	1,734,000
Outstanding options, weighted average remaining contractual term	6 years 8 months 23 days	5 years 8 months 5 days	10 years 2 months 6 days	8 years 9 months 7 days	8 years 4 months 24 days
Outstanding options, weighted average exercise price	$ 5.07	$ 7.62	$ 13.39	$ 19.21	$ 15.55
Exercisable options (in shares)	169,000	133,000	165,000	164,000	631,000
Exercisable options, weighted average exercise price	$ 5.06	$ 7.46	$ 13.90	$ 20.01	$ 11.76