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Income Tax Reconciliation (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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%

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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