Net Loss Per Share (Schedule of Earnings Per Share, Basic and Diluted)(Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Net loss from continuing operations attributable to stockholders	$ (51,713)		$ (6,918)		$ (189,686)		$ (11,624)
Less: dividends declared on preferred shares	(158)		(70)		(315)		(70)
Net loss from continuing operations attributable to common stockholders	(51,871)		(6,988)		(190,001)		(11,694)
Net income (loss) from discontinued operations attributable to common stockholders	34		(152)		73		(474)
Net loss attributable to common stockholders	$ (51,837)		$ (7,140)		$ (189,928)		$ (12,168)
Weighted average common shares outstanding	162,368,538	[1]	68,312,582	[1]	157,904,082	[1]	45,961,046	[1]
Basic and diluted net loss per share from continuing operations attributable to common stockholders	$ (0.32)		$ (0.10)		$ (1.20)		$ (0.25)
Basic and diluted net loss per share from discontinued operations attributable to stockholders	$ 0.00		$ 0.00		$ 0.00		$ (0.01)
Basic and diluted net loss per share attributable to common stockholders	$ (0.32)		$ (0.10)		$ (1.20)		$ (0.26)
Antidilutive securtities excluded from computation of earnings per share					9,051,661
Restricted Unvested Common Stock [Member]
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Antidilutive securtities excluded from computation of earnings per share					343,000
Class A Units [Member] [Member]
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Antidilutive securtities excluded from computation of earnings per share					545,454
Class B Units [Member]
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Antidilutive securtities excluded from computation of earnings per share					283,018
Preferred Class C [Member]
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Antidilutive securtities excluded from computation of earnings per share					28,398,213
Excluding Pro Forma Adjustment [Domain]
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted average common shares outstanding					166,694,122
Basic and diluted net loss per share attributable to common stockholders					$ (1.14)
Common Stock [Member]
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Stock Repurchased During Period, Shares					27,739,523
Common Stock [Member] | ARCT III Shares Repurchased [Member]
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Stock Repurchased During Period, Shares					(27,749,693)

[1] Weighted average shares for the six months ended June 30, 2013 are adjusted on a pro forma basis as if the purchase of 27.7 million shares of ARCT III common stock for cash, purchased in conjunction with the ARCT III Merger, had been completed at the beginning of the period. Weighted average shares for the six months ended June 30, 2013, excluding this pro forma adjustment, were 166,694,122 and net loss per share was $1.14 per share, basic and diluted.