Stock-Based Compensation (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		45,000	215,000
Common stock option vested in one year (in shares)			35,000
Vesting period		4 years
Common stock option vested in four year (in shares)			180,000
Stock option exercised (in shares)	132,960	113,334	605,494
Total intrinsic value of options exercised	$ 455,000	$ 1,500,000	$ 3,000,000
Granted (in dollars per share)		$ 4.16	$ 4.85
Fair value of options vested during the year	1,200,000
Unrecognized compensation cost related to unvested awards under share-based plans	$ 1,400,000
Cost expected to be recognized over a weighted average period	1 year
Stock-based compensation expense	$ 1,975,000	$ 2,641,000	$ 3,157,000
Stock-based compensation expense, tax benefits recognized	$ 672,000	$ 915,000	$ 1,100,000
The 2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option expiration period	10 years
Percentage of voting power (in hundredths)	10.00%
Term of option if an employee or consultant possesses more than 10 percent of voting power	5 years
Number of common stock reserved for issuance (in shares)	2,200,000
The 2011 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option expiration period	10 years
Percentage of voting power (in hundredths)	10.00%
Term of option if an employee or consultant possesses more than 10 percent of voting power	5 years
Number of common stock reserved for issuance (in shares)	1,400,000
The 2005 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option expiration period	10 years
Percentage of voting power (in hundredths)	10.00%
Term of option if an employee or consultant possesses more than 10 percent of voting power	5 years
Number of common stock reserved for issuance (in shares)	1,000,000
The 1999 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option expiration period	10 years
Percentage of voting power (in hundredths)	10.00%
Term of option if an employee or consultant possesses more than 10 percent of voting power	5 years
Number of common stock reserved for issuance (in shares)	1,000,000
Vesting period	4 years
The 1999 Plan [Member] | Non-employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock reserved for issuance (in shares)	75,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	2 years		4 years
Granted (in shares)	86,992		197,481
Granted (in dollars per share)	$ 9.11		$ 10.46