Notes Payable and Long-Term Debt (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Summary of outstanding debt obligations
Long-term Debt, Total	$ 139,950,000	$ 128,236,000
Less current maturities	4,805,000	6,361,000
Notes Payable, Noncurrent	135,145,000	121,875,000
Term loan
Summary of outstanding debt obligations
Long-term Debt, Total	119,400,000	119,700,000
Revolving credit facility | Domestic Revolving Credit Facility
Summary of outstanding debt obligations
Long-term Debt, Total	9,500,000	200,000
Revolving credit facility | International Revolving Credit Facility
Summary of outstanding debt obligations
Long-term Debt, Total	4,440,000	2,554,000
Revolving credit facility | Consortium of banks in Spain
Summary of outstanding debt obligations
Long-term Debt, Total	4,479,000	5,037,000
Revolving credit facility | Ibercaja Bank In Spain
Summary of outstanding debt obligations
Long-term Debt, Total	556,000	745,000
Revolving credit facility | National Bank of Abu Dhabi
Summary of outstanding debt obligations
Long-term Debt, Total	$ 1,575,000