Fair Value Measurements (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Fair Value Measurements
Number of employees covered under life insurance policies	41
Combined face value of life insurance policies	$ 41,200,000
Cash surrender value	2,900,000	2,500,000
Contingent earn-out obligations
Reconciliation of the fair value of contingent earn-out obligations that use significant unobservable inputs (Level 3)
Balance at beginning of year	1,966,000	2,488,000
Issuances		140,000
Adjustments to fair value	(1,646,000)	(662,000)
Balance at end of period	320,000	1,966,000
Recurring basis | Total
Fair Value Measurements
Cash and cash equivalents	52,054,000
Life insurance - cash surrender value	2,943,000
Contingent earn-out obligations	320,000
Recurring basis | Quoted Market Prices In Active Markets for Identical Assets (Level 1)
Fair Value Measurements
Cash and cash equivalents	52,054,000
Recurring basis | Significant Other Observable Inputs (Level 2)
Fair Value Measurements
Life insurance - cash surrender value	2,943,000
Recurring basis | Significant Unobservable Inputs (Level 3)
Fair Value Measurements
Contingent earn-out obligations	$ 320,000