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Components of Deferred Tax Assets and Deferred Tax Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets    
Tax credits and loss carryforwards $ 18,779 $ 51,811
Accrued liabilities 6,964 6,816
Incentive compensation 16,621 12,913
Other 4,736 6,897
Deferred Tax Assets, Gross 47,100 78,437
Deferred tax liabilities    
Property, plant and equipment (295) (163)
Intangibles (4,993) (4,026)
Prepaid assets (690) (1,160)
Convertible note discount (6,585) (7,846)
Other (29) (231)
Deferred tax liability (12,592) (13,426)
Net deferred tax asset before valuation allowances and reserves 34,508 65,011
Valuation allowances (1,438) (1,852)
Net deferred tax asset $ 33,070 $ 63,159