Fair-Value Measurements (Schedule of Fair Value of Financial Assets and Liabilities) (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Assets:
Cash equivalents	$ 28,052,000		$ 25,073,000
Foreign currency instruments	193,000
Common stock of foreign public company	806,000		952,000
Interest rate swap
Liabilities:
Interest rate swap
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Cash equivalents
Foreign currency instruments
Common stock of foreign public company
Interest rate swap	1,269,000	[1]	1,517,000	[2]
Liabilities:
Interest rate swap	(2,753,000)	[3]	(3,119,000)	[4]
Interest Rate Swap [Member]
Derivative asset:
Liability for fixed rate leg	4,100,000		4,100,000
Receivable for floating rate leg	5,400,000		5,600,000
Derivative liability:
Liability for fixed rate leg	3,300,000		3,800,000
Receivable for floating rate leg	$ 500,000		$ 700,000

[1] Net of $5.4 million receivable floating leg and $4.1 million liability fixed leg

[2] Net of $5.6 million receivable floating leg and $4.1 million liability fixed leg

[3] Net of $0.5 million receivable floating leg and $3.3 million liability fixed leg

[4] Net of $0.7 million receivable floating leg and $3.8 million liability fixed leg