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Shareholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2013
Shareholders' Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
 
 
Foreign Currency Translation Adjustment
 
Employee Benefit Plans
 
Total
Balances at December 31, 2012
$
(1,295
)
 
$
(455,166
)
 
$
(456,461
)
 
Other comprehensive income before reclassifications
440

 
—

 
440

 
Amounts reclassified from accumulated other comprehensive loss
—

 
3,102

 
3,102

Balances at March 31, 2013
$
(855
)
 
$
(452,064
)
 
$
(452,919
)