Tax Receivable Agreement Obligation To Related Parties (Narrative) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Tax Receivable Agreement Obligation To Related Parties [Abstract]
Percentage of cash savings	85.00%
Retained ratio of tax savings	15.00%
Cumulative payments under tax receivable agreement	$ 355,244
Initial fair value of tax receivable agreement	$ 185,125