Acquisitions - Reconciliation of Acquisition and Integration Liabilities (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Charged to acquisition and integration costs		$ 1,274	$ 840	$ 484
Post-employment Benefit
Business Acquisition [Line Items]
Balance at beginning of period		762	0
Charged to acquisition and integration costs		17	1,453
Reclassifications (a)	[1]	0	0
Payments		(732)	(691)
Balance at end of period		47	762	0
Exit Costs
Business Acquisition [Line Items]
Balance at beginning of period		868	0
Charged to acquisition and integration costs		88	1,132
Reclassifications (a)	[1]	(255)	0
Payments		(655)	(264)
Balance at end of period		$ 46	$ 868	$ 0

[1] Exit liability has been reduced as a result of a lease amendment and has been reclassified to deferred rent, which will be amortized over the remaining lease term.