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Income Taxes - Reconciliation of the Statutory Federal Tax Provision to Income Tax (Benefit) Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Statutory federal tax provision (35)%	$ 35,729	$ 44,518	$ 34,272
Tax impact of REIT election	(22,277)	(31,101)	(21,544)
State income tax provision, net of federal tax benefit	1,652	1,703	1,745
Foreign income tax benefit	(430)	(3,080)	(2,266)
Tax reform impact on U.S. taxes	(2,143)	0	0
Tax reform impact on foreign taxes	(2,076)	0	0
Other	(248)	359	(632)
Income tax provision	$ 10,207	$ 12,399	$ 11,575
Statutory federal tax provision (as a percent)	35.00%	35.00%	35.00%

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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