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Transactions With Related Parties (Details) (USD $)	12 Months Ended
Transactions With Related Parties (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Member Of Board Of Directors [Member]
Related Party Transaction [Line Items]
Repurchases of common stock	$ 5,600,000	$ 321,000	$ 794,000
Revenue from related parties	273,000	353,000	267,000
Purchases from related party transactions	45,000	47,000	22,000
Son Of Member Of Board Of Directors [Member]
Related Party Transaction [Line Items]
Revenue from related parties	$ 616,000	$ 345,000	$ 312,000
Maximum [Member]
Related Party Transaction [Line Items]
Percentage of commisions included in stock repurchases	1.00%	1.00%	1.00%

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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