Fair-Value Measurements (Schedule of Fair Value of Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016		Dec. 31, 2015
Derivative asset:
Common stock of foreign public company, original cost	$ 500
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Assets:
Cash equivalents	8,468		$ 5,189
Assets held for sale
Foreign currency options
Common stock of foreign public company	762	[1]	819
Interest rate swaps
Liabilities:
Interest rate swaps
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Cash equivalents
Assets held for sale
Foreign currency options
Common stock of foreign public company
Interest rate swaps	5,784	[2]
Liabilities:
Interest rate swaps			(2,400)	[3]
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Cash equivalents
Assets held for sale			4,988
Foreign currency options
Common stock of foreign public company
Interest rate swaps
Liabilities:
Interest rate swaps
Interest Rate Swap [Member]
Derivative liability:
Liability for fixed rate leg	21,400		7,400
Receivable for floating rate leg	$ 15,600		$ 9,800

[1] Original cost basis $0.5 million.

[2] Net of $21.4 million receivable floating leg and $15.6 million liability fixed leg

[3] Net of $7.4 million receivable floating leg and $9.8 million liability fixed leg