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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Weighted average assumptions used in estimating fair value of options granted [Abstract]
Stock-based compensation expense	$ 1,889	$ 2,221	$ 5,326	$ 5,952
New issue of shares of common stock as a result of RSUs which vested (in shares)			103,818
Options exercised (in shares)			143,100
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	0	206,500	294,000	261,500
Options granted, weighted average fair values (in dollars per share)		$ 11.47	$ 4.19	$ 11.23
Weighted average assumptions used in estimating fair value of options granted [Abstract]
Dividend yield			0.00%	0.00%
Expected stock price volatility			86.00%	87.00%
Risk-free interest rate			2.21%	2.56%
Expected life term			6 years	6 years
Unrecognized stock-based compensation expense expected to be recognized	$ 6,214		$ 6,214
Weighted average vesting amortization period			2 years 7 months 2 days
Restricted Stock [Member]
Weighted average assumptions used in estimating fair value of options granted [Abstract]
RSUs granted (in shares)	0	137,666	162,665	154,332
Weighted average grant date fair value of RSU's granted (in dollars per share)		$ 15.40	$ 5.57	$ 15.30
Unrecognized stock-based compensation expense expected to be recognized	$ 3,996		$ 3,996
Weighted average vesting amortization period			2 years 6 months 25 days
2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance (in shares)	14,124,469		14,124,469
Shares available for grant (in shares)	1,469,552		1,469,552

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The weighted average fair value at grant date for nonvested equity-based awards issued 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 maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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