Accounts Payable and Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Summary of accounts payable and accrued expenses
Accounts payable – trade	$ 2,101	$ 1,512
Accrued compensation and commissions	6,921	6,493
Accrued professional fees	1,223	1,279
Accrued step-up leases	1,329	1,379
Accrued income taxes	1,980	1,487
Other accrued expenses	6,039	4,125
Total accounts payable and accrued expenses	$ 19,593	$ 16,275