Organization and Basis of Presentation Prior period adjustments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Prior Period Adjustments [Line Items]
Cash outflow for shares related to tax withholdings			$ 4,668	$ 45,006
Development service fee expense	$ 17,828	$ 0	$ 28,832	0
Other Income [Member] | Scenario, Previously Reported [Member]
Prior Period Adjustments [Line Items]
Development service fee income		1,198		2,570
General and Administrative Expense [Member] | Scenario, Previously Reported [Member]
Prior Period Adjustments [Line Items]
Development service fee expense		$ 1,054		2,152
Accounting Standards Update 2016-09 [Member] | Scenario, Previously Reported [Member]
Prior Period Adjustments [Line Items]
Cash outflow for shares related to tax withholdings				$ 4,100