Stockholders' Equity - Schedule of Dividends Paid Previously or Declared (Details) (USD $)	3 Months Ended						12 Months Ended	0 Months Ended	6 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2012	Jul. 09, 2013 Subsequent Event [Member]	Jul. 09, 2013 Subsequent Event [Member]
Stockholders' Equity Note [Abstract]
Dividends paid per share	$ 0.20	$ 0.10	$ 0.21	$ 0.19	$ 0.17	$ 0.17	$ 1.24
Sub-Total							$ 0.74
Supplemental dividend paid per share			$ 0.50
Subsequent Event [Line Items]
Dividend declared per share								$ 0.25
Sub-Total									$ 0.55
Dividend paid previously or declared, per share									$ 0.55