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Inventories (Inventory reserve) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Inventory Valuation Reserves Increase (Decrease) [Roll Forward]      
Balance at beginning of period $ 21,125 $ 17,440 $ 10,106
Charged to expense 10,093 6,107 10,910
Deductions or other (4,799) (2,422) (3,576)
Balance at end of period $ 26,419 $ 21,125 $ 17,440