Property Transactions Acquisition Pro Forma (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues	$ 361,383us-gaap_Revenues	$ 210,741us-gaap_Revenues	$ 136,846us-gaap_Revenues
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	31,850	112,041	27,605
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	53,008us-gaap_ProfitLoss	126,829us-gaap_ProfitLoss	47,919us-gaap_ProfitLoss
Net Income (Loss) Available to Common Stockholders, Basic	45,519	109,097	32,821
Acquisition Pro Forma [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues	388,791	354,047
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	31,695	119,825
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	52,853	134,613
Net Income (Loss) Available to Common Stockholders, Basic	$ 45,364	$ 116,881
Earnings Per Share, Basic	$ 0.22	$ 0.62
Earnings Per Share, Diluted	$ 0.22	$ 0.62

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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