The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Investment in Hotel Properties (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Intangible Assets
Amortization expense	$ 7,543us-gaap_AmortizationOfIntangibleAssets	$ 10,115us-gaap_AmortizationOfIntangibleAssets	$ 20,198us-gaap_AmortizationOfIntangibleAssets
Intangible assets included in hotel properties
Intangible Assets
Value of intangibles at acquisition	147,947	171,889
Accumulated amortization	(22,453)	(44,426)
Net balance of intangibles at end of period	125,494	127,463
Amortization expense	6,877	9,448	19,491
Intangible assets included in hotel properties \| Easement agreements
Intangible Assets
Value of intangibles at acquisition	9,727	9,727
Intangible assets included in hotel properties \| Advanced bookings
Intangible Assets
Value of intangibles at acquisition	10,621	35,154
Amortization expense	1,769	4,560	14,824
Intangible assets included in hotel properties \| Ground/air lease agreements
Intangible Assets
Value of intangibles at acquisition	121,850	121,850
Amortization expense	4,113	4,113	4,113
Intangible assets included in hotel properties \| In-place lease agreements
Intangible Assets
Value of intangibles at acquisition	6,795	6,223
Amortization expense	830	454	348
Intangible assets included in hotel properties \| Above/(below) market lease agreements, net
Intangible Assets
Value of intangibles at acquisition	(3,896)	(3,915)
Amortization expense	(304)	(148)	(6)
Intangible assets included in hotel properties \| Below-market management agreement
Intangible Assets
Value of intangibles at acquisition	2,850	2,850
Amortization expense	$ 469	$ 469	$ 212
Minimum \| Ground/air lease agreements
Intangible Assets
Estimated useful life	22 years
Minimum \| In-place lease agreements
Intangible Assets
Estimated useful life	2 months
Minimum \| Above/(below) market lease agreements, net
Intangible Assets
Estimated useful life	2 months
Minimum \| Below-market management agreement
Intangible Assets
Estimated useful life	3 years
Maximum \| Ground/air lease agreements
Intangible Assets
Estimated useful life	76 years
Maximum \| In-place lease agreements
Intangible Assets
Estimated useful life	13 years
Maximum \| Above/(below) market lease agreements, net
Intangible Assets
Estimated useful life	17 years
Maximum \| Below-market management agreement
Intangible Assets
Estimated useful life	8 years