Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Jun. 29, 2014	Dec. 31, 2013
Accrued Expenses
Accrued compensation and benefits	$ 4,811	$ 7,154
Accrued contract obligation expense	2,411	1,194
Accrued federal, excise and other taxes	3,009	4,902
Accrued interest	4,111	2,879
Accrued commissions	1,129	929
Other accrued expenses	5,568	5,100
Total accrued expenses	$ 21,039	$ 22,158