Acquired Intangible Assets (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Acquired Indefinite-lived Intangible Assets [Line Items]
Total acquired intangible assets		$ 99,017		$ 99,017		$ 98,742
Less accumulated amortization	[1]	(40,031)		(40,031)		(35,830)
Net acquired intangible assets		58,986		58,986		62,912
Amortization of acquired intangible assets [Abstract]
Amortization expense		2,100	$ 1,500	4,200	$ 2,700
Estimated amortization expense, remainder of 2017		3,800		3,800
Estimated amortization expense in year 2018		7,600		7,600
Estimated amortization expense in year 2019		6,300		6,300
Estimated amortization expense in year 2020		5,900		5,900
Estimated amortization expense in years 2021 through 2031		30,200		30,200
Customer Relationships [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Total acquired intangible assets		87,333		87,333		87,070
Trademarks and Trade Names [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Total acquired intangible assets		6,800		6,800		6,800
Intangible assets acquired [Abstract]
Amount of acquired indefinite-lived intangible assets		5,200		5,200
Non-compete Agreements [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Total acquired intangible assets		3,201		3,201		3,189
Patents [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Total acquired intangible assets		723		723		723
Supply Agreements [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Total acquired intangible assets		800		800		800
Leaseholds [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Total acquired intangible assets		$ 160		$ 160		$ 160

[1] Applies to all intangible assets, except for trademarks and trade names totaling $5.2 million, which have indefinite useful lives and, as such, are not being amortized.