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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Comprehensive loss:        
Net loss $ (9,507) $ (12,023) $ (30,638) $ (28,701)
Other comprehensive income before income tax effect:        
Net unrealized gain (loss) on financial instruments 0 2 0 (218)
Net loss reclassified to income on financial instruments 0 68 0 549
Net gain on foreign currency cash flow hedges reclassified as income (46) (47) (139) (140)
Net gain arising during the period 0 0 10,349 49
Amortization of prior service benefit during the period (968) (1,029) (2,912) (3,085)
Amortization of net loss during the period 1,880 2,562 6,362 7,687
Other comprehensive income before income tax effect 866 1,556 13,660 4,842
Income tax effect (383) (382) (1,148) (1,147)
Other comprehensive income 483 1,174 12,512 3,695
Total comprehensive loss $ (9,024) $ (10,849) $ (18,126) $ (25,006)