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Dividends - Narrative (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2014
Jun. 30, 2013
Jul. 08, 2014
Subsequent Event [Member]
Subsequent Event [Line Items]          
Aggregate cash dividends paid $ 12,186 $ 12,077 $ 24,263 $ 22,931  
Dividend declared date         Jul. 08, 2014
Dividend declared per common share (in dollars per share)         $ 0.17375
Dividend payable date Jun. 27, 2014 Mar. 28, 2014     Sep. 26, 2014
Dividend record date May 23, 2014 Feb. 21, 2014     Aug. 22, 2014