Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Goodwill and Other Intangible Assets (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Goodwill	$ 44,438us-gaap_Goodwill	$ 40,183us-gaap_Goodwill
Amortization expense	$ 3,323us-gaap_AmortizationOfIntangibleAssets	$ 2,831us-gaap_AmortizationOfIntangibleAssets	$ 2,169us-gaap_AmortizationOfIntangibleAssets
Customer Relationships [Member]
Goodwill [Line Items]
Weighted average amortization period	8 years
Minimum [Member]
Goodwill [Line Items]
Estimated useful life of intangible assets	7 years
Maximum [Member]
Goodwill [Line Items]
Estimated useful life of intangible assets	10 years