Goodwill and Other Intangible Assets (Other Intangible Assets) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Amortized Intangible Assets [Line Items]
Goodwill and other long-lived asset impairment charge	$ 0	$ 9,224	$ 0	$ 9,224
Amortization of Intangible Assets
Amortization of intangible assets	11,399	10,531	21,783	$ 17,367
Estimated amortization of intangible assets, remainder of 2018	22,000		22,000
Estimated amortization of intangible assets, 2019	42,000		42,000
Estimated amortization of intangible assets, 2020	39,000		39,000
Estimated amortization of intangible assets, 2021	34,000		34,000
Estimated amortization of intangible assets, 2022	28,000		28,000
Estimated amortization of intangible assets, after 2022	$ 72,000		$ 72,000
Other Businesses [Member] | Forney [Member]
Amortized Intangible Assets [Line Items]
Goodwill and other long-lived asset impairment charge		$ 9,200