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Commitments And Contingencies (Details) $ in Thousands			3 Months Ended
Commitments And Contingencies (Details) $ in Thousands	Sep. 28, 2015 USD ($)	Aug. 23, 2013 lawsuit	Mar. 31, 2017 USD ($) lawsuit	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Other Commitments [Line Items]
Rent expense under operating leases			$ 3,682	$ 3,256
Total liabilities recorded for earnouts			$ 7,868		$ 10,806
Number of stockholder class action lawsuits \| lawsuit		2	9
Provision for arbitration award	$ 11,282
Redeemable noncontrolling interests			$ 8,872		$ 8,872
Alleged actual damages	7,254
Fees and expenses	2,318
Prejudgment interest	$ 1,710
Potential Future Payment [Member] \| Put Option [Member]
Other Commitments [Line Items]
Aggregate amount to owner upon exercise			$ 8,872