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 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2011
Scenario As Previously Reported [Member]
Sep. 30, 2011
Scenario As Previously Reported [Member]
Dec. 31, 2011
Scenario As Previously Reported [Member]
Sep. 30, 2011
Adjustment [Member]
Sep. 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 3,523 7,239 8,580 6,594 7,210 6,738   29 (144)  
Ending balances, retained earnings 107,022 98,794 107,022 98,794 100,345 100,345 99,433 (1,551) (1,551) (1,522)
Beginning balances, total stockholders' equity     173,647 199,099   200,506 175,169   (1,407) (1,522)
Ending balances, total stockholders' equity $ 175,543 $ 188,065 $ 175,543 $ 188,065 $ 189,616 $ 189,616 $ 175,169 $ (1,551) $ (1,551) $ (1,522)