Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Amortized Intangible Assets [Line Items]
Goodwill and other long-lived asset impairment charge	$ 312	$ 9,200	$ 0	$ 9,536	$ 0
Amortization of Intangible Assets
Amortization of intangible assets	10,923		$ 6,620	28,290	$ 19,160
Estimated amortization of intangible assets, remainder of 2017	10,000			10,000
Estimated amortization of intangible assets, 2018	38,000			38,000
Estimated amortization of intangible assets, 2019	37,000			37,000
Estimated amortization of intangible assets, 2020	33,000			33,000
Estimated amortization of intangible assets, 2021	28,000			28,000
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