Borrowings (Subsequent payments due on borrowings) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Debt Instrument [Line Items]
2013	$ 9,452	[1]
2014	83
Total debt	9,535		5,499
Equipment Term Loan [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 3,900

[1] Contractually scheduled payments related to the Equipment Term Loan of $3.9 million were callable by the bank.