Shareholders Equity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Schedule of Earnings Per Share, Basic and Diluted [Line Items]
Net Income (Loss) Available to Common Stockholders, Diluted	$ 57,561	$ 46,598	$ 109,110	$ 82,584
Net Income (Loss) Attributable to Parent	59,519	48,450	112,974	85,796
Dividends, Preferred Stock	1,469	1,469		2,399
Preferred Stock Dividends, Income Statement Impact			2,938
Undistributed Earnings Allocated to Participating Securities	489	383	926	813
Net income attributable to common shareholders	$ 57,561	$ 46,598	$ 109,110	$ 82,584
Weighted average number of common shares outstanding - basic	165,335	157,863	165,198	133,909
Weighted average number of common shares outstanding - diluted	166,147	158,390	166,052	134,406
Earnings Per Share, Basic	$ 0.35	$ 0.30	$ 0.66	$ 0.62
Earnings Per Share, Diluted	$ 0.35	$ 0.29	$ 0.66	$ 0.61
Employee Stock Option
Schedule of Earnings Per Share, Basic and Diluted [Line Items]
Weighted average number of common shares outstanding - diluted	812	527	854	497