Noncontrolling Interests Redeemable Noncontrolilng Interests Rollforward (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Redeemable noncontrolling interests at beginning of period	$ 2,526,000
Noncontrolling interests at beginning of period	0
Net income attributable to noncontrolling interests	100,000	$ 1,050,000
Redeemable noncontrolling interests at end of period	662,000
Noncontrolling interests at end of period	0
Redeemable noncontrolling interests
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Redeemable noncontrolling interests at beginning of period	2,526,000	17,461,000
Net income attributable to noncontrolling interests	100,000	758,000
Distributions	(100,000)	(736,000)
Purchases/ (sales) of ownership interests	12,000	167,000
Amortization of equity compensation	17,000	122,000
Adjustments to fair value	(1,893,000)	(1,450,000)
Redeemable noncontrolling interests at end of period	$ 662,000	16,322,000
Noncontrolling interests
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Noncontrolling interests at beginning of period		5,186,000
Net income attributable to noncontrolling interests		291,000
Distributions		(282,000)
Purchases/ (sales) of ownership interests		0
Amortization of equity compensation		161,000
Adjustments to fair value		(531,000)
Noncontrolling interests at end of period		$ 4,825,000