Other Intangible Assets and Goodwill (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets [Abstract]
Gross carrying value	$ 22,404	$ 28,248	$ 30,050
Accumulated amortization	(16,230)	(19,964)	(19,293)
Net carrying value	6,174	8,284	10,757
Aggregate amortization expense	2,110	2,473	3,180
Weighted-average amortization period (Period in years)	9.5
Estimated amortization expense
For the year ending December 31, 2013	1,860
For the year ending December 31, 2014	1,611
For the year ending December 31, 2015	1,368
For the year ending December 31, 2016	1,037
For the year ending December 31, 2017	$ 298

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The accumulated amount of amortization of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

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Aggregate amount of intangible asset amortization recognized as expense during the period.

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Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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The aggregate sum of gross carrying value of a major finite-lived intangible asset class, less accumulated amortization and any impairment charges. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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The calculated weighted-average useful life of all finite-lived intangible assets.

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The amount of amortization expense expected to be recognized during year five of the five succeeding fiscal years.

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The amount of amortization expense expected to be recognized during year four of the five succeeding fiscal years.

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The amount of amortization expense expected to be recognized during year one of the five succeeding fiscal years.

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The amount of amortization expense expected to be recognized during year three of the five succeeding fiscal years.

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The amount of amortization expense expected to be recognized during year two of the five succeeding fiscal years.

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