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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Long Term Cash Incentive Plan [Member]
Dec. 31, 2010
Long Term Cash Incentive Plan [Member]
Dec. 31, 2012
Long Term Cash Incentive Plan [Member]
Dec. 31, 2011
Long Term Cash Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expenses related to employee benefit plans $ 1,469 $ 1,527 $ 1,801        
Deferred compensation liability related to employee benefit plans       0   0 2,173
Deferred compensation liability, current and noncurrent 0         606  
Period to receive cash under Long-Term Cash Incentive Plans       3 years 3 years    
Awards granted under the LTCIP           $ 0 $ 0