Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity (Details)

v2.4.0.6
Shareholders' Equity (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stockholders' Equity Note [Abstract]        
Maximum offering price under ATM program $ 100,000,000      
Aggregate Number of Shares Sold 2,274,568      
Aggregate Gross Proceeds 49,575,000      
Aggregate Net Proceeds $ 48,400,000 $ 0 $ 48,400,000 $ 0
Average Sales Price Per Share $ 21.79      
Stock issuance program, expiry date     February 2, 2012