Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Amortized Intangible Assets [Line Items]
Goodwill and other long-lived asset impairment charge	$ 9,224	$ 0	$ 9,224	$ 0
Amortization of Intangible Assets
Amortization of intangible assets	10,531	$ 6,278	17,367	$ 12,540
Estimated amortization of intangible assets, remainder of 2017	22,000		22,000
Estimated amortization of intangible assets, 2018	37,000		37,000
Estimated amortization of intangible assets, 2019	36,000		36,000
Estimated amortization of intangible assets, 2020	33,000		33,000
Estimated amortization of intangible assets, 2021	27,000		27,000
Estimated amortization of intangible assets, after 2021	93,000		$ 93,000
Forney [Member]
Amortized Intangible Assets [Line Items]
Goodwill and other long-lived asset impairment charge	$ 9,200