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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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NET INCOME PER COMMON SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Impact Of Equity Awards [Line Items]
Price range of option: from									$ 10.11	$ 10.52	$ 6.43
Price range of option: to									$ 33.9	$ 48.21	$ 48.21
Earnings Per Share, Basic and Diluted [Abstract]
Net Income (Loss) Attributable to Parent	$ 10,850us-gaap_NetIncomeLoss	$ 6,473us-gaap_NetIncomeLoss	$ 8,137us-gaap_NetIncomeLoss	$ 1,363us-gaap_NetIncomeLoss	$ 9,507us-gaap_NetIncomeLoss	$ 6,875us-gaap_NetIncomeLoss	$ 9,893us-gaap_NetIncomeLoss	$ (251)us-gaap_NetIncomeLoss	$ 26,823us-gaap_NetIncomeLoss	$ 26,024us-gaap_NetIncomeLoss	$ 11,268us-gaap_NetIncomeLoss
Weighted Average Number Of Shares Outstanding Basic	37,779,000	37,693,000	37,687,000	37,660,000	37,471,000	37,386,000	37,344,000	37,138,000	37,763,353	37,417,807	36,906,468
Earnings Per Share Basic									$ 0.71us-gaap_EarningsPerShareBasic	$ 0.7us-gaap_EarningsPerShareBasic	$ 0.31us-gaap_EarningsPerShareBasic
Incremental Common Shares Attributable to Share-based Payment Arrangements									900,713	883,688	903,178
Weighted Average Number Of Diluted Shares Outstanding	38,730,000	38,482,000	38,446,000	38,501,000	38,336,000	38,153,000	38,103,000	37,138,000	38,664,066	38,301,495	37,809,646
Earnings Per Share Diluted									$ 0.69us-gaap_EarningsPerShareDiluted	$ 0.68us-gaap_EarningsPerShareDiluted	$ 0.3us-gaap_EarningsPerShareDiluted
Options Activity [Member]
Impact Of Equity Awards [Line Items]
Excluded shares as anti-dilutive under the treasury stock method									30,000	37,000	46,000
Restricted Stock Units Activity [Member] \| Restricted Stock Units Service Conditions [Member]
Impact Of Equity Awards [Line Items]
Excluded shares as anti-dilutive under the treasury stock method									1,000	4,000	939,000
Restricted Stock Units Activity [Member] \| Restricted Stock Units Service And Market Conditions But Market Not Met [Member]
Impact Of Equity Awards [Line Items]
Excluded shares as anti-dilutive under the treasury stock method									193,000	0	200,000
Restricted Stock Units Activity [Member] \| Restricted Stock Units Service And Performance Conditions But Performance Not Met [Member]
Impact Of Equity Awards [Line Items]
Excluded shares as anti-dilutive under the treasury stock method									11,000	0	0