Other Intangible Assets (Schedule of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Cost	$ 36,409	$ 44,134
Accumulated Amortization	12,243	15,040
Other intangible assets, net	24,166	29,094
Acquired Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	35,119	35,344
Accumulated Amortization	11,058	9,047
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	4,314	4,532
Accumulated Amortization	1,654	1,425
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	23,337	23,337
Accumulated Amortization	6,688	5,336
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	402	402
Accumulated Amortization	402	348
Brand Names [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	6,151	6,151
Accumulated Amortization	1,513	1,205
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	915	922
Accumulated Amortization	801	733
Deferred Financing Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	1,290	8,790
Accumulated Amortization	$ 1,185	$ 5,993