Debt (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Jul. 31, 2014
Line of Credit Facility [Line Items]
Additional borrowings			$ 90,000,000
Scheduled principal payments [Abstract]
2015	13,438,000
2016	16,125,000
2017	18,812,000
2018	24,188,000
2019	160,062,000
Total long-term debt	232,625,000
Less: Current maturities of long-term debt	(13,438,000)	0
Noncurrent portion of long-term debt	219,187,000	0
New Secured Credit Agreement [Member]
Line of Credit Facility [Line Items]
Additional borrowings	100,000,000
Percentage of capital stock of foreign subsidiaries given as collateralized security to line of credit (in hundredths)	65.00%
Basis spread on variable rate (in hundredths)	2.75%
Interest on borrowings outstanding (in hundredths)	2.94%
Effective LIBOR rate (in hundredths)	0.19%
Line of credit, current borrowing capacity	27,000,000
Available to borrow without violating our Leverage Ratio covenant	16,200,000
Deferred financing costs	5,800,000
Deferred financing costs amortization period	5 years
Interest expense incurred	4,000,000
New Secured Credit Agreement [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (in hundredths)	1.00%
New Secured Credit Agreement [Member] | Federal Funds Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (in hundredths)	0.50%
Line of Credit [Member]
Line of Credit Facility [Line Items]
Available line of credit		30,000,000
Interest on borrowings outstanding (in hundredths)		1.40%
Line of credit, current borrowing capacity		18,000,000
Line of credit, amount outstanding		12,000,000
Line of credit facility, expiration date		Oct. 14, 2016
Interest expense incurred	100,000	200,000
Repayments of line of credit	12,000,000
Revolving Credit Facility [Member] | New Secured Credit Agreement [Member]
Line of Credit Facility [Line Items]
Available line of credit	50,000,000
Additional borrowings			20,000,000
Line of credit, amount outstanding	23,000,000
Term Loan [Member] | New Secured Credit Agreement [Member]
Line of Credit Facility [Line Items]
Available line of credit	145,000,000
Line of credit, amount outstanding	145,000,000
Delayed Draw Term Loan [Member] | New Secured Credit Agreement [Member]
Line of Credit Facility [Line Items]
Available line of credit	70,000,000
Additional borrowings			70,000,000
Line of credit, amount outstanding	$ 70,000,000
Minimum [Member] | New Secured Credit Agreement [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (in hundredths)	1.75%
Minimum [Member] | New Secured Credit Agreement [Member] | Alternate Base Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (in hundredths)	0.75%
Minimum [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (in hundredths)		1.00%
Maximum [Member] | New Secured Credit Agreement [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (in hundredths)	3.00%
Maximum [Member] | New Secured Credit Agreement [Member] | Alternate Base Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (in hundredths)	2.00%
Maximum [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (in hundredths)		1.50%