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Income Tax Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Computed expected tax provision $ 13,381 $ 39,063 $ 24,822
State and local taxes, net of federal income tax impact 1,279 4,398 1,482
Adjustment for state deferred tax rate (762) (742) 2,916
State investment tax credits (2,263) (9,077) 0
Federal credits and net operating losses (10,234) 4,121 (412)
Federal manufacturing deduction 0 (3,288) (2,443)
Uncertain tax positions (69,144) 4,801 2,610
Non-deductible acquisition costs 0 0 (1,215)
Change in valuation allowances (1,334) 6,932 2,796
U.S. tax provision on foreign operations 67 (33) 365
Other 289 1,285 325
Income tax provision $ (68,721) $ 47,460 $ 31,246
Effective tax rate (179.70%) 42.50% 44.10%