Stockholders' Equity - Stock Options Outstanding Rollforward (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012 Stock options [Member]	Dec. 31, 2011 Stock options [Member]
Number of Options
Outstanding at December 31, 2011 (in shares)	1,077,798
Granted (in shares)	138,183
Exercised (in shares)	(160,944)
Expired, canceled or forfeited (in shares)	(33,246)
Outstanding at December 31, 2012 (in shares)	1,021,791
Exercisable at December 31, 2012 (in shares)	349,449	290,911	361,994
Weighted Average Exercise Price
Outstanding at December 31, 2011 (in dollars per share)	$ 10.93
Granted (in dollars per share)	$ 13.20
Exercised (in dollars per share)	$ 8.35
Expired, canceled or forfeited (in dollars per share)	$ 13.74
Outstanding at December 31, 2012 (in dollars per share)	$ 11.55
Exercisable at December 31, 2012 (in dollars per share)	$ 11.90	$ 10.52	$ 9.36
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Stock options, Outstanding, Weighted Average Remaining Contractual Life	2 years 9 months 29 days	3 years 3 months 11 days	2 years 7 months 17 days
Stock options, Exercisable, Weighted Average Remaining Contractual Life	2 years 2 months 16 days	1 year 9 months 11 days	1 year 2 months 5 days
Stock options, Outstanding, Aggregate Intrinsic Value	$ 1,958	$ 112	$ 1,254
Stock options, Exercisable, Aggregate Intrinsic Value	$ 619	$ 85	$ 851

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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