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Income Taxes REIT Taxable Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]                      
Net income (loss) attributable to stockholders $ (30,072) $ (8,232) $ (1,193) $ 1,106 $ 3,689 $ 2,464 $ 560 $ 2,219 $ (38,391) $ 8,932 $ 13,360
Net loss (income) from subsidiaries                 31,395 (17,785) (23,725)
Net loss attributable to REIT operations                 (6,996) (8,853) (10,365)
Book/tax differences                 45,677 42,556 45,280
REIT taxable income subject to 90% dividend requirement                 $ 38,681 $ 33,703 $ 34,915