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Interest Expense
 12 Months Ended
Dec. 31, 2014
Banking and Thrift [Abstract]  
Interest Expense
Interest Expense
The following table summarizes the components of interest expense for the periods presented:
 
Year Ended December 31,
 
2014
 
2013
 
2012
Interest on borrowings and related fees
$
91,866

 
$
80,263

 
$
56,080

Accretion of original issue discount 1
—

 
431

 
1,367

Amortization of debt issuance costs
4,197

 
3,413

 
2,695

Capitalized interest 2
(7,232
)
 
(5,266
)
 
(803
)
 
$
88,831

 
$
78,841

 
$
59,339


______________________
1 Includes accretion of original issue discount attributable to the 2016 Senior Notes that were retired in 2013 and the 4.50% Convertible Senior Subordinated Notes due 2012 that were retired in 2012.
2 The increase in capitalized interest in 2014 and 2013 compared to 2012 is attributable to a significant increase in qualifying activities that are in process to bring our Eagle Ford unproved and proved undeveloped properties, including those acquired in the EF Acquisition, into production.