Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns Roll Forward
Unrecognized tax benefits, beginning balance		$ 298	$ 906
Reductions due to lapses of applicable statute of limitations and the conclusion of income tax examinations		$ (298)	(608)
Acquisitions	$ 6,814
Unrecognized tax benefits, ending balance	$ 6,814		$ 298