Share-Based Compnesation-Exercise Prices (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding at end of year	1,892,493	1,924,941
Outstanding, remaining contractual term	5 years 9 months 18 days
Outstanding at end of year (usd per share)	$ 5.67	$ 5.61
Options exercisable at end of year	1,317,795
Options exercisable (usd per share)	$ 5.99
$2.24—$4.48
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 2.24
Exercise price range, upper range limit	$ 4.48
Outstanding at end of year	684,141
Outstanding, remaining contractual term	5 years 4 months 24 days
Outstanding at end of year (usd per share)	$ 3.75
Options exercisable at end of year	316,499
Options exercisable (usd per share)	$ 3.26
$4.48—$6.72
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 4.48
Exercise price range, upper range limit	$ 6.72
Outstanding at end of year	389,320
Outstanding, remaining contractual term	5 years 1 month 6 days
Outstanding at end of year (usd per share)	$ 5.64
Options exercisable at end of year	275,997
Options exercisable (usd per share)	$ 5.78
$6.72—$8.96
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 6.72
Exercise price range, upper range limit	$ 8.96
Outstanding at end of year	809,032
Outstanding, remaining contractual term	6 years 6 months
Outstanding at end of year (usd per share)	$ 7.26
Options exercisable at end of year	715,299
Options exercisable (usd per share)	$ 7.22
$8.96—$11.20
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 8.96
Exercise price range, upper range limit	$ 11.20
Outstanding at end of year	10,000
Outstanding, remaining contractual term	2 years 1 month 6 days
Outstanding at end of year (usd per share)	$ 9.99
Options exercisable at end of year	10,000
Options exercisable (usd per share)	$ 9.99