Stock-Based Compensation Stock Options, Restricted Stock Awards, and Stock in Lieu of Directors' Fees (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended								3 Months Ended		6 Months Ended		12 Months Ended	6 Months Ended
	Jan. 31, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jan. 03, 2012	Jun. 30, 2013 Stock options	Jun. 30, 2012 Stock options	Jun. 30, 2013 Stock options	Jun. 30, 2012 Stock options	Jun. 30, 2013 Restricted stock awards, common stock	Jun. 30, 2012 Restricted stock awards, common stock	Jun. 30, 2013 Restricted stock awards, common stock	Jun. 30, 2012 Restricted stock awards, common stock	Jun. 30, 2013 Restricted stock awards, common stock Employee	Jun. 30, 2012 Restricted stock awards, common stock Employee	Jun. 30, 2012 Restricted stock awards, common stock Executive Officer	Jun. 30, 2013 Restricted stock awards, common stock Director	Jun. 30, 2012 Restricted stock awards, common stock Director	Jun. 30, 2013 Performance based awards	Jun. 30, 2013 Common stock in lieu of cash Director	Jun. 30, 2012 Common stock in lieu of cash Director	Jun. 30, 2013 Common stock in lieu of cash Director	Jun. 30, 2012 Common stock in lieu of cash Director	Dec. 31, 2012 Common stock in lieu of cash Director	Jun. 30, 2013 Options Granted in 2013 [Member]	Jun. 30, 2013 Options Granted in 2012 [Member]	Jun. 30, 2013 Options Granted in 2012 [Member] Stock options	Jun. 30, 2013 Year Two Stock options	Jun. 30, 2013 Year Four Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 520	$ 334	$ 859	$ 652		$ 202	$ 65	$ 269	$ 125	$ 264	$ 211	$ 481	$ 416							$ 54	$ 58	$ 109	$ 111	$ 184
Stock option awards granted									44,175	67,750
Options granted, vesting percentage																													50.00%	50.00%
Award vesting period															4 years	4 years		2 years	2 years									4 years
Market price on date of grant													$ 16.43	$ 16.25
Expiration period of options																										10 years	7 years
Shares of common stock as restricted stock awards granted in period													78,806	71,376	24,925	62,160	3,000	6,146	6,216	47,735
Number of shares issued in lieu of cash to directors	12,592
Fair market share price						$ 14.63