Significant Accounting Policies (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Significant Accounting Policies [Line Items]
Option to purchase noncontrolling interest impairment charge	$ 0	$ 0	$ 0	$ 0
Beginning Balance			60,180,000
Redemptions	(11,947,000)	$ (19,174,000)	(11,947,000)	(19,174,000)
Granted			(9,295,000)
Ending Balance	62,955,000		62,955,000		$ 60,180,000
Redeemable Noncontrolling Interest [Member]
Significant Accounting Policies [Line Items]
Beginning Balance			60,180,000	$ 69,471,000	69,471,000
Redemptions			(269,000)		(1,708,000)
Granted			0		2,274,000
Changes in redemption value			2,783,000		(9,604,000)
Currency Translation Adjustments			261,000		(253,000)
Ending Balance	$ 62,955,000		$ 62,955,000		$ 60,180,000