Short-term and Long-term Debt - Line of Credit (Details) (USD $)							9 Months Ended					0 Months Ended			0 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Term Notes	Sep. 30, 2014 Revolving line of credit	Dec. 31, 2013 Revolving line of credit	Sep. 30, 2014 Revolving line of credit Minimum	Sep. 30, 2014 Revolving line of credit Selected LIBOR rate	Sep. 30, 2014 Revolving line of credit LIBOR for a fixed rate term	Sep. 30, 2014 Line of Credit	Sep. 30, 2014 Revolving line of credit	Dec. 31, 2013 Revolving line of credit	Jul. 15, 2014 TMV LLC	Oct. 13, 2014 Subsequent Event Term Notes	Oct. 13, 2014 Subsequent Event Term Notes	Oct. 20, 2014 Subsequent Event TMV LLC	Oct. 07, 2014 Subsequent Event TMV LLC
Line of Credit Facility [Line Items]
Business Combination, Consideration Transferred, Liability, Due Date Extension Payment																$ 1,000,000
Payments to Acquire Businesses, Gross												10,000,000			59,000,000
Line of credit amount			70,000,000	30,000,000					9,800,000					70,000,000
Debt Instrument, Term													10 years
Long-term Debt	84,718,000	4,693,000								20,200,000	0
Line of credit outstanding balance					0
Interest rate on line of credit, variable rate							1.75%	1.50%
Minimum tangible net worth required						225,000,000
Liquid assets						25,000,000								20,000,000
Tangible net worth				390,290,000
Liquid Assets	60,666,000
Business Combination, Consideration Transferred, Liabilities Incurred												$ 60,000,000