Stockholders' Equity - Additional Information (Details)								1 Months Ended	3 Months Ended												12 Months Ended					39 Months Ended
	Mar. 01, 2017 USD ($) $ / shares	Jan. 28, 2016 USD ($) shares	Jan. 02, 2015 USD ($) shares	Dec. 09, 2014	Jul. 08, 2014 USD ($) $ / shares shares	Apr. 07, 2011 USD ($) $ / shares shares	Mar. 15, 2011	Mar. 31, 2015 shares	Sep. 30, 2016 shares	Jun. 30, 2016 shares	Mar. 31, 2016 shares	Dec. 31, 2015 $ / shares shares	Sep. 30, 2015 shares	Jun. 30, 2015 shares	Mar. 31, 2015 shares	Dec. 31, 2014 shares	Sep. 30, 2014 shares	Jun. 30, 2014 shares	Mar. 31, 2014 shares	Dec. 31, 2013 shares	Dec. 31, 2016 USD ($) individual $ / shares shares	Dec. 31, 2015 USD ($) individual $ / shares shares	Dec. 31, 2014 USD ($) individual $ / shares shares	Dec. 31, 2013 USD ($) shares	Dec. 31, 2012 USD ($) employee shares	Dec. 31, 2016 USD ($) $ / shares shares	Jul. 25, 2016 shares	Jan. 04, 2016 USD ($)	Dec. 13, 2013 employee	Dec. 27, 2012 USD ($) employee	May 16, 2012 shares	Jul. 31, 2008 USD ($)	Aug. 01, 2007 USD ($)	Nov. 30, 2004 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized (shares)												75,000,000									75,000,000	75,000,000				75,000,000
Common stock par value (shares) | $ / shares												$ 0.0001									$ 0.0001	$ 0.0001				$ 0.0001
Preferred stock authorized (shares)												25,000,000									25,000,000	25,000,000				25,000,000
Preferred stock par value (usd per share) | $ / shares												$ 0.0001									$ 0.0001	$ 0.0001				$ 0.0001
Stock options outstanding (shares)												0									0	0				0
Common stock outstanding (shares)												20,886,261									20,525,614	20,886,261				20,525,614
Preferred stock outstanding (shares)												0									0	0				0
Dividends declared (usd per share) | $ / shares																					$ 0.75	$ 0.625	$ 0.50
Common stock repurchase program, authorized amount | $																												$ 10,000,000.0				$ 50,000,000.0
Shares acquired under common stock repurchase program (shares)																					388,255
Treasury stock acquired | $																					$ 6,500,000
Common stock repurchased (shares)																					7,817,708					7,817,708
Common stock purchases, value | $																					$ 85,500,000					$ 85,500,000
Granted (shares)									6,034	5,605	6,141	5,869	6,242	5,494	4,823	5,328	7,110	6,006	5,093	6,475						70,220
Amortized period							45 months
Total stock based compensation | $																					$ 854,000	$ 1,868,000	$ 3,838,000
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend rate (usd per share) | $ / shares	$ 0.125
Dividends declared | $	$ 2,600,000
2004 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity securities approved under the 2004 Equity Plan (shares)																																		1,878,976
2012 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity securities approved under the 2004 Equity Plan (shares)																															2,194,986
Equity securities granted (shares)																															1,300,000
Equity securities available under the 2004 Equity Plan (shares)																															894,986
2012 Equity Plan | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)					5,820
Value of shares granted | $					$ 100,000
Share price (usd per share) | $ / shares					$ 15.74
2011 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs at fair value | $																								$ 5,200,000	$ 1,300,000
Number of employees affected due to modification | employee																													51	18
Amortization of share based compensation | $																									200,000					$ 1,600,000
Fair value of RSUs, net of forfeitures | $																							600,000	500,000
Total stock based compensation | $																							$ 3,400,000	$ 2,800,000	$ 100,000
2011 Long Term Incentive Plan | Software Operations
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs at fair value | $						$ 3,000,000
Closing price of common stock (usd per share) | $ / shares						$ 15.68
2011 Long Term Incentive Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)																					234,711	260,900
Restricted stock units awarded to certain eligible employees (shares)																								434,811	122,673
Restricted stock units and cash dividends forfeited (shares)																									101,294
Fair value of restricted stock units and cash dividends forfeited | $																									$ 1,400,000
Shares outstanding (shares)												242,468				0				617,027	451,493	242,468	0	617,027	232,966	451,493
RSUs, forfeited (shares)																								50,750
Options vested and expected to vest (shares)																559,689							559,689
Units expected to be converted (shares)								559,689							559,689
Shares sold to company for required income tax withholding (shares)								217,211
2011 Long Term Incentive Plan | Restricted Stock Units | Software Operations
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units awarded to certain eligible employees (shares)						211,587
2011 Long Term Incentive Plan | Forfeited
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based compensation | $																									$ 400,000
2015 Long Term Incentive Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amortized period				36 months
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity securities granted (shares)												0										0					250,000
Award required holding period																					2 years
Duration of company history to determine volatility rate																					3 years
Executive
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of departed employees | employee																									2
Eligible Employees | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)																							5,820
Eligible Employees | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)																					212,643	242,468
Eligible Employees | 2015 Long Term Incentive Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)																					7,629
Chairperson Of Audit Committee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual payment amount | $																																	$ 55,000
Value of shares required to hold | $																					$ 165,000					$ 165,000
Non Executive Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual payment amount | $																																	45,000
Value of shares required to hold | $																					$ 135,000					$ 135,000
Grace period of restricted stock threshold																					3 years
Non Executive Directors | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)																					23,649	21,887	24,684
Amortized period																					1 year
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of individuals who elected stock in lieu of cash for services | individual																					0	0	0
Annually | Chairperson Of Audit Committee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual stock award | $																																	70,000
Annually | Non Executive Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual stock award | $																																	$ 60,000
January 2, 2015 | 2015 Long Term Incentive Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)			254,777
Value of shares granted | $			$ 4,400,000
January 2, 2015 | New or Promoted Employees | 2015 Long Term Incentive Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)																						6,123
January 28, 2016 | 2015 Long Term Incentive Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)		227,082
Value of shares granted | $		$ 3,800,000
Maximum | Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Offering period																					6 months