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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
 
Balance at
Beginning
of Period
 
Charged to
Expenses
 
Adjustments
to Valuation
Accounts
 
Deductions
 
Balance at
End of Period
2013 - Allowance for doubtful accounts
$
2,168

 
$
453

 
$
—

 
$
(500
)
 
$
2,121

2012 - Allowance for doubtful accounts
1,498

 
1,064

 
—

 
(394
)
 
2,168

2011 - Allowance for doubtful accounts
1,926

 
1,447

 
—

 
(1,875
)
 
1,498