Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity (Details)

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Shareholders' Equity (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Jun. 30, 2010
Mar. 31, 2011
ATM Program [Member]
Maximum offering price under ATM program   $ 100,000,000    
Aggregate Number of Shares Sold 0     1,516,379
Aggregate Gross Proceeds       49,575,000
Aggregate Net Proceeds   48,400,000 0 48,400,000
Average Sales Price Per Share       $ 32.69