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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Identifiable intangible assets (Details) (USD $)	3 Months Ended
Identifiable intangible assets (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Software costs capitalized	$ 622,000us-gaap_PaymentsForSoftware	$ 994,000us-gaap_PaymentsForSoftware
Amortization of capitalized software costs	500,000	464,000
Amortization of identifiable intangible assets	249,000us-gaap_AmortizationOfIntangibleAssets	0us-gaap_AmortizationOfIntangibleAssets
Components of identifiable intangible assets [Abstract]
Intangible assets - gross	29,146,000		28,524,000
Less accumulated amortization	(6,321,000)		(5,572,000)
Intangible assets - net	22,825,000		22,952,000
Future amortization of intangible assets assuming straight-line amortization of capitalized software costs [Abstract]
2015	2,418,000
2016	3,580,000
2017	3,479,000
2018	3,377,000
2019	3,069,000
Thereafter	4,702,000
Total	20,625,000us-gaap_FiniteLivedIntangibleAssetsNet
Acquired and internally developed software costs [Member]
Components of identifiable intangible assets [Abstract]
Intangible assets - gross	26,756,000		26,134,000
Customer Relationships [Member]
Components of identifiable intangible assets [Abstract]
Intangible assets - gross	160,000		160,000
Non-competition Agreements [Member]
Components of identifiable intangible assets [Abstract]
Intangible assets - gross	30,000		30,000
Trademarks, Trade Names (non-amortizable) [Member]
Components of identifiable intangible assets [Abstract]
Intangible assets - gross	$ 2,200,000		$ 2,200,000
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Remaining estimated economic life of the product	3 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Remaining estimated economic life of the product	7 years