Borrowings (Details) (USD $)					12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Revolving credit facilities	Dec. 31, 2012 Revolving credit facilities	Dec. 31, 2013 Revolving credit facilities Minimum	Dec. 31, 2013 Revolving credit facilities Maximum	Dec. 31, 2013 Revolving credit facilities U.S. LIBOR	Dec. 31, 2013 Revolving credit facilities U.S. LIBOR Minimum	Dec. 31, 2013 Revolving credit facilities U.S. LIBOR Maximum	Dec. 31, 2013 Revolving credit facilities U.S. Federal Funds Rate	Dec. 31, 2013 Revolving credit facilities U.S. Wells Fargo Prime rate	Dec. 31, 2013 Revolving credit facilities U.S. Wells Fargo Prime rate Minimum	Dec. 31, 2013 Revolving credit facilities U.S. Wells Fargo Prime rate Maximum	Dec. 31, 2013 Revolving credit facilities U.S. Wells Fargo Default Covenant Maximum	Dec. 31, 2013 Revolving credit facilities U.S. Wells Fargo Default Covenant Consecutive Days	Dec. 31, 2013 Revolving credit facilities U.S. Wells Fargo Default Covenant Consecutive Days Maximum	Dec. 31, 2013 Revolving credit facilities U.S. Wells Fargo Default Covenant Cure	Dec. 31, 2013 Revolving credit facilities U.S. Wells Fargo Default Covenant Cure Minimum	Dec. 31, 2013 Revolving credit facilities Foreign LIBOR	Dec. 31, 2013 Revolving credit facilities Foreign LIBOR Minimum	Dec. 31, 2013 Revolving credit facilities Foreign LIBOR Maximum	Dec. 31, 2013 Term loans	Dec. 31, 2012 Term loans
Borrowings
Maximum borrowing capacity			$ 60,000,000
Available borrowing base			56,700,000
Bank debt			0	19,775,000																		0	6,250,000
Debt outstanding	53,000	26,127,000
Term Loan, face																						7,500,000.0
Percentage points added to the reference rate							1.00%	2.25%	2.75%	0.50%		1.25%	1.75%							2.25%	2.75%
Variable interest rate base							LIBOR			Federal Funds Rate	prime rate								LIBOR
Unused line fee					0.375%	0.50%
Weighted average interest rate			3.33%
Percentage of facility available for borrowing														25.00%		30.00%		30.00%
Available borrowing capacity under credit facility														15,000,000		18,000,000		18,000,000
Number of consecutive days during which the entity has to maintain certain covenants															5 days		30 days
Unamortized debt fees			$ 1,900,000