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Income taxes Significant components of Income tax expense (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Significant components of income taxes expense [Abstract]      
U.S. federal current expense (benefit) $ 532 $ (161) $ (22)
State current expense (benefit) (445) (669) 1,395
Foreign current expense 6,198 9,808 13,467
Total current expense 6,285 8,978 14,840
U.S. federal deferred benefit (3,905) (1,564) (5,772)
State deferred benefit (207) 0 0
Foreign deferred tax expense 958 1,496 5,291
Total deferred benefit (3,154) (68) (481)
Total income tax expense $ 3,131 $ 8,910 $ 14,359