Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2012

Equity [Abstract]

Schedule of Common Stock Outstanding Roll Forward [Table Text Block]

The following table presents a summary of the changes in the number of common shares outstanding for the periods indicated:

	Nine Months Ended
	September 30,
	2012	2011
Balance at beginning of period	40,382,530	30,342,897
Common stock issued under ATM program	402,494	409,237
Common stock issued under DRIP	9,279	2,111
Common stock issued via public offering	13,332,748	9,200,000
Common stock issued or redeemed under Stock and Incentive Plans	241,663	426,031
Balance at end of period	54,368,714	40,380,276

Schedule of Additional Paid in Capital [Table Text Block]

The following table presents a rollforward of the Company's changes in additional paid-in capital for the nine months ended September 30, 2012:

	Additional Paid-In Capital
Balance as of January 1, 2012	$	634,683
Common stock issuances:
DRIP issuances	90
ATM issuances	3,674
Secondary offering	119,859
Incentive plans	192
Amortization of restricted stock	1,268
Capitalized expenses	(119		)
Balance as of September 30, 2012	$	759,647

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

Accumulated other comprehensive income as of September 30, 2012 and December 31, 2011 is comprised of the following items:

	September 30, 2012			December 31, 2011
Available for sale investments:
Unrealized gains	$	110,332		$	36,091
Unrealized losses	(10,747		)	(13,902		)
	99,585			22,189
Hedging instruments:
Unrealized losses	(43,695		)	(25,444		)
	(43,695		)	(25,444		)
Accumulated other comprehensive income (loss)	$	55,890		$	(3,255	)

Share-based Arrangements with Employees and Nonemployees [Abstract]

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

The following table presents a rollforward of the restricted stock activity for the periods presented:

	Three Months Ended			Nine Months Ended
	September 30,			September 30,
	2012		2011	2012		2011
Restricted stock at beginning of period	454,117		330,500	365,506		25,000
Restricted stock granted	—		35,006	220,821		358,006
Restricted stock vested	(2,917	)	—	(135,127	)	(17,500	)
Restricted stock outstanding at end of period	451,200		365,506	451,200		365,506