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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2013
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
A reconciliation of the expected income tax expense (benefit) on income (loss) before income taxes using the statutory federal income tax rate of 35% for the three and nine months ended September 30, 2013 and 2012 to income tax expense is as follows (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2013
 
2012
 
2013
 
2012
Expected income tax expense (benefit) at 35%
$
(49,106
)
 
$
7,417

 
$
(86,360
)
 
$
17,282

Foreign taxes (tax rate differential and foreign tax differences)
9,124

 
(919
)
 
9,052

 
(4,083
)
Nondeductible expenses and other
819

 
(133
)
 
(30
)
 
371

Deferred tax asset valuation allowance
96,117

 
(328
)
 
96,788

 
96

Total income tax expense
$
56,954

 
$
6,037

 
$
19,450

 
$
13,666