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Debt and Financing Arrangements (Tables)
 12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Summary of Unsecured Credit Facility Rates for the years ended December 31, 2018 and 2017 were as follows (includes bank debt and interest rate swaps):

 

 

 

2018

 

 

2017

 

Weighted average rates

 

3.08%

 

 

2.72%

 

Range of effective rates

 

2.12% - 5.50%

 

 

2.19% - 4.75%

 
Summary of Recognized Interest Expense For the years ended December 31, 2018, 2017 and 2016, we recognized interest expense as follows (in thousands):

 

 

2018

 

 

2017

 

 

2016

 

Credit facility (1)

 

$

6,645

 

 

$

6,675

 

 

$

6,585

 

2006 Notes (2)

 

 

—

 

 

 

—

 

 

 

8

 

Balance at December 31

 

$

6,645

 

 

$

6,675

 

 

$

6,593

 

 

 

(1)

Components of interest expense related to the credit facility include amortization of deferred financing costs, commitment fees and line of credit fees.

(2)

We redeemed the remaining 3.125% Convertible Senior Subordinated Notes during the second quarter of 2016 under an optional early redemption provision.