Stockholders' Equity - Summary of Changes in Noncontrolling Interest (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Noncontrolling Interest [Line Items]
Noncontrolling Interest, Beginning of Period	$ 41,877us-gaap_MinorityInterest
Net Income	93	104
Other Comprehensive Income (Loss) (Including a Reallocation of $2 and $5)	3,690
Conversion of Units to Common Stock	0	0
Reallocation - Additional Paid-in-Capital	0
Noncontrolling Interest, End of Period	41,426us-gaap_MinorityInterest
Noncontrolling Interest
Noncontrolling Interest [Line Items]
Noncontrolling Interest, Beginning of Period	41,877	44,369
Net Income	93	104
Unit Distributions	(557)	(458)
Other Comprehensive Income (Loss) (Including a Reallocation of $2 and $5)	142	(36)
Conversion of Units to Common Stock	(95)	(1,279)
Reallocation - Additional Paid-in-Capital	(34)	48
Noncontrolling Interest, End of Period	$ 41,426	$ 42,748

Amount of other increase (decrease) in additional paid in capital (APIC).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Value of stock issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).

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