Quarterly report pursuant to Section 13 or 15(d)

Business and Summary of Significant Accounting Principles (Shareholders Equity Statements Immaterial Error Correction) (Details)

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Business and Summary of Significant Accounting Principles (Shareholders Equity Statements Immaterial Error Correction) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2011
Scenario As Previously Reported [Member]
Jun. 30, 2011
Scenario As Previously Reported [Member]
Dec. 31, 2011
Scenario As Previously Reported [Member]
Jun. 30, 2011
Adjustment [Member]
Jun. 30, 2011
Adjustment [Member]
Dec. 31, 2011
Adjustment [Member]
Beginning balances, retained earnings     $ 97,911 $ 92,200   $ 93,607 $ 99,433   $ (1,407) $ (1,522)
Net income (loss) 3,805 (2,044) 5,057 (645) (1,957) (472)   (87) (173)  
Ending balances, retained earnings 103,322 91,555 103,322 91,555 93,135 93,135 99,433 (1,580) (1,580) (1,522)
Beginning balances, total stockholders' equity     173,647 199,099   200,506 175,169   (1,407) (1,522)
Ending balances, total stockholders' equity $ 171,294 $ 180,326 $ 171,294 $ 180,326 $ 181,906 $ 181,906 $ 175,169 $ (1,580) $ (1,580) $ (1,522)