Business, Basis of Presentation and Significant Accounting Policies (Restructuring Charges) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,400	$ 4,700	$ 5,100	$ 4,100
Restructuring reserve, current	5,700				$ 5,700
Other current assets	55,109				55,109	$ 68,190
Held-for-Sale [Member]
Restructuring Cost and Reserve [Line Items]
Other current assets	$ 1,100				1,100
General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges					12,300
Other Expense, Net [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges					$ 2,900