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Share-Based Compensation (Details 2) - USD ($)			3 Months Ended		9 Months Ended
	Jun. 10, 2015	Feb. 24, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Additional share-based compensation disclosures
Compensation expense			$ 226,000	$ 215,000	$ 873,000	$ 945,000
Options
Shares Under Options
Outstanding at the beginning of the period (in shares)					340,107
Granted (in shares)					17,526
Exercised (in shares)					(58,758)
Outstanding at the end of the period (in shares)			298,875		298,875
Exercisable at the end of the period (in shares)			246,376		246,376
Vested and expected to vest at the end of the period (in shares)			298,875		298,875
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)					$ 12.84
Granted (in dollars per share)					19.97
Exercised (in dollars per share)					4.40
Outstanding at the end of the period (in dollars per share)			$ 14.92		14.92
Exercisable at the end of the period (in dollars per share)			13.66		13.66
Vested and expected to vest at the end of the period (in dollars per share)			$ 14.92		$ 14.92
Weighted Average Remaining Contractual Life
Outstanding at the end of the period					3 years 11 months 1 day
Exercisable at the end of the period					4 years 1 month 21 days
Vested and expected to vest at the end of the period					3 years 11 months 1 day
Aggregate Intrinsic Value
Outstanding at the end of the period			$ 2,437,000		$ 2,437,000
Exercisable at the end of the period			2,307,000		2,307,000
Vested and expected to vest at the end of the period			$ 2,437,000		2,437,000
Assumptions used to determine the intrinsic fair market value of options using Black Scholes option pricing model
The total intrinsic value of all options exercised					989,000	3,400,000
Additional share-based compensation disclosures
Total amount of consideration received from the exercised options					$ 258,000	$ 709,000
Shares surrendered in lieu of payment of exercise price and withholding taxes					1,632	32,164
Average market price of shares surrendered in lieu of payment of exercise price and withholding taxes (in dollars per share)					$ 21.97	$ 25.42
Restricted Stock Units
Restricted Stock Units
Unvested at the beginning of the period (in shares)					35,088
Awarded (in shares)					23,975
Shares vested (in shares)					(10,426)
Unvested at the end of the period (in shares)			48,637		48,637
Weighted Average Award Date Fair Value
Unvested at the beginning of the period (in dollars per share)					$ 17.87
Awarded (in dollars per share)					23.46
Shares vested (in dollars per share)					18.35
Unvested at the end of the period (in dollars per share)			$ 20.11		$ 20.11
Additional share-based compensation disclosures
Compensation expense			$ 82,000	71,000	$ 231,000	$ 207,000
Net-share settlement (in shares)					3,405	9,878
Net-share settlement, market price per share					$ 23.15	$ 25.88
Unrecognized compensation expense			1,000,000		$ 1,000,000
Weighted average period of recognition of unrecognized compensation expense					3 years 6 months
Director Stock Option
Shares Under Options
Granted (in shares)	17,526
Weighted Average Exercise Price
Granted (in dollars per share)	$ 19.97
Assumptions used to determine the intrinsic fair market value of options using Black Scholes option pricing model
Expected volatility (as a percent)					32.30%
Expected dividends (as a percent)					0.00%
Risk free interest rate (as a percent)					1.00%
Expected term					5 years
Weighted average grant date fair value of options granted (in dollars per share)					$ 5.99
Director and employees | Options
Additional share-based compensation disclosures
Compensation expense			44,000	44,000	$ 237,000	$ 310,000
Incentive Plan | Chief Executive Officer | Common Stock
Restricted Stock Units
Awards		$ 400,000
Additional share-based compensation disclosures
Compensation expense			$ 100,000	$ 100,000	$ 300,000	$ 300,000

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Unrecognized cost of unvested share-based compensation awards.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Gross number of share options (or share units) granted during the period.

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