Stock-Based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended			1 Months Ended		6 Months Ended	1 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Stock options	Mar. 31, 2012 Restricted stock awards	Mar. 31, 2011 Restricted stock awards	Jun. 30, 2012 Restricted stock awards	Mar. 31, 2012 Restricted stock awards Non-employee directors	Mar. 31, 2011 Restricted stock awards Non-employee directors	Mar. 31, 2012 Restricted stock awards Executive management	Mar. 31, 2011 Restricted stock awards Executive management
Stock-Based Compensation
Stock-based compensation cost recognized	$ 300,000	$ 200,000	$ 500,000	$ 400,000
Shares
Options outstanding at the beginning of the period (in shares)					722,400
Options outstanding at the end of the period (in shares)					722,400
Options exercisable at the end of the period (in shares)					589,900
Weighted Average Exercise Price
Options outstanding at the beginning of the period (in dollars per share)					$ 8.06
Options outstanding at the end of the period (in dollars per share)					$ 8.06
Options exercisable at the end of the period (in dollars per share)					$ 8.31
Weighted Average Remaining Contractual Term (Years)
Options outstanding at the end of the period					4 years 11 months 16 days
Options exercisable at the end of the period					4 years 5 months 19 days
Aggregate Intrinsic Value (in thousands)
Options outstanding at the end of the period					849,000
Options exercisable at the end of the period					621,000
Unrecognized compensation
Total unrecognized compensation cost					400,000
Weighted average period for recognition of total unrecognized compensation cost					1 year 1 month 6 days			2 years 4 months 24 days
Restricted Stock Awards
Period over which stock awards vest (in years)									1 year	1 year	3 years	3 years
Weighted-average grant-date fair value of awards (in dollars per share)						$ 8.78	$ 6.58
Total unrecognized compensation cost								$ 1,500,000
Summary of restricted stock awards and related activity
Shares outstanding at the beginning of the period								96,126
Shares granted								165,607	26,250	27,258	139,357	68,868
Shares vested								(50,212)
Shares outstanding at the end of the period								211,521