Stock-Based Compensation (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock option vested in one year (in shares)	35,000	40,000	40,000
Common stock option vested in four year (in shares)	180,000	460,000	470,000
Stock option exercised (in shares)	605,494	50,374	0
Granted (in shares)		500,000	510,000
Granted (in dollars per share)		$ 5.06	$ 3.62
Intrinsic value of options exercised	$ 3,000,000	$ 116,000
Fair value of options vested during the year	2,300,000
Unrecognized compensation cost related to unvested awards under share-based plans	5,100,000
Cost expected to be recognized over a weighted average period	1 year 6 months
Stock-based compensation expense	3,157,000	2,595,000	1,800,000
Stock-based compensation expense, tax benefits recognized	$ 1,100,000	$ 910,000	$ 612,000
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
Number of common stock reserved for issuance (in shares)	1,000,000
The 2003 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option expiration period	10 years
Number of common stock reserved for issuance (in shares)	760,000
Granted (in shares)	501,000
Conversion due to reorganization (in shares)	576,101
The 1999 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option expiration period	10 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	4 years
Granted (in shares)	197,841	0	0
Granted (in dollars per share)	$ 10.46
Non Vested Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	215,000
Granted (in dollars per share)	$ 4.85