Fair-Value Measurements (Schedule of Fair Value of Financial Assets and Liabilities) (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Assets:
Cash equivalents	$ 30,586	$ 33,171
Common stock of foreign public company	848	562
Interest rate swap	1,852
Liabilities:
Interest rate swap	(3,699)	(4,718)
Quoted Prices in Active Markets (Level 1) [Member]
Assets:
Cash equivalents	30,586	33,171
Common stock of foreign public company	848	562
Interest rate swap
Liabilities:
Interest rate swap
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Cash equivalents
Common stock of foreign public company
Interest rate swap	1,852
Liabilities:
Interest rate swap	$ (3,699)	$ (4,718)