Quarterly report pursuant to Section 13 or 15(d)

Dividends - Additional Information (Details)

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Dividends - Additional Information (Details) (USD $)
3 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Aug. 06, 2014
Subsequent Event
Dividends Payable [Line Items]          
Paid cash dividends, per share     $ 0.20 $ 0.17  
Dividends declared per common share $ 0.10 $ 0.09 $ 0.20 $ 0.17 $ 0.10
Dividend payable, date declared, day month and year         Aug. 06, 2014
Dividends payable, date to be paid, day, month and year         Sep. 12, 2014
Dividends payable, date of record, day, month and year         Aug. 22, 2014