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Indebtedness (Tables)
 12 Months Ended
Mar. 31, 2014
Summary of Debt Outstanding

The following table summarizes debt outstanding at March 31:

 

(In thousands)

      2014         2013        

4.44% July 2003 senior notes due fiscal 2014

    $                   —         140,000      

4.61% July 2003 senior notes due fiscal 2016

      35,000         35,000      

3.28% September 2010 senior notes due fiscal 2016

      42,500         42,500      

3.90% September 2010 senior notes due fiscal 2018

      44,500         44,500      

3.95% September 2010 senior notes due fiscal 2018

      25,000         25,000      

4.12% September 2010 senior notes due fiscal 2019

      25,000         25,000      

4.17% September 2010 senior notes due fiscal 2019

      25,000         25,000      

4.33% September 2010 senior notes due fiscal 2020

      50,000         50,000      

4.51% September 2010 senior notes due fiscal 2021

      100,000         100,000      

4.56% September 2010 senior notes due fiscal 2021

      65,000         65,000      

4.61% September 2010 senior notes due fiscal 2023

      48,000         48,000      

4.06% August 2011 senior notes due fiscal 2019

      50,000         50,000      

4.54% August 2011 senior notes due fiscal 2022

      65,000         65,000      

4.64% August 2011 senior notes due fiscal 2022

      50,000         50,000      

4.26% September 2013 senior notes due fiscal 2021

      123,000         —      

5.01% September 2013 senior notes due fiscal 2024

      250,000         —      

5.16% September 2013 senior notes due fiscal 2026

      127,000         —      

NOK denominated notes due fiscal 2025

      29,837         —      

NOK denominated notes due fiscal 2026

      50,028         —      

NOK denominated borrowing agreement due fiscal 2015

      5,837         —      

NOK denominated borrowing agreement due fiscal 2019

      4,168         —      

Term Loan

      300,000         125,000      

Revolving line of credit

      —         110,000        
   $ 1,514,870         1,000,000      

Less: Current maturities of long-term debt

      9,512         —        

Total

    $       1,505,358         1,000,000      

 
Debt Costs

Interest and debt costs incurred, net of interest capitalized, for the years ended March 31, are as follows:

 

(In thousands)    2014      2013      2012        

Interest and debt costs incurred, net of interest capitalized

    $       43,814         29,745         22,308      

Interest costs capitalized

      11,497         10,602         14,743        

Total interest and debt costs

    $ 55,311         40,347         37,051      

 
September 2013 Senior Notes
  
Schedule of Aggregate Amount of Senior Unsecured Notes Outstanding

September 2013 Senior Notes

On September 30, 2013, the company executed a note purchase agreement for $500 million and issued $300 million of senior unsecured notes to a group of institutional investors. The company issued the remaining $200 million of senior unsecured notes on November 15, 2013. A summary of these outstanding notes at March 31, 2014, is as follows:

 

(In thousands, except weighted average data)   

March 31,

2014

       

Aggregate debt outstanding

    $           500,000     

Weighted average remaining life in years

      9.4     

Weighted average coupon rate on notes outstanding

      4.86 %   

Fair value of debt outstanding

      520,979       
August 2011 Senior Notes
  
Schedule of Aggregate Amount of Senior Unsecured Notes Outstanding

August 2011 Senior Notes

On August 15, 2011, the company issued $165 million of senior unsecured notes to a group of institutional investors. A summary of these outstanding notes at March 31, is as follows:

 

(In thousands, except weighted average data)

      2014        2013       

Aggregate debt outstanding

    $         165,000        165,000     

Weighted average remaining life in years

      6.6        7.6     

Weighted average coupon rate on notes outstanding

      4.42 %      4.42 %   

Fair value of debt outstanding

      168,653        179,802       
September 2010 Senior Notes
  
Schedule of Aggregate Amount of Senior Unsecured Notes Outstanding

September 2010 Senior Notes

In fiscal 2011, the company completed the sale of $425 million of senior unsecured notes. A summary of the aggregate amount of these outstanding notes at March 31, is as follows:

 

(In thousands, except weighted average data)

      2014        2013       

Aggregate debt outstanding

    $         425,000        425,000     

Weighted average remaining life in years

      5.6        6.6     

Weighted average coupon rate on notes outstanding

      4.25 %      4.25 %   

Fair value of debt outstanding

      436,254        458,520       
July 2003 Senior Notes
  
Schedule of Aggregate Amount of Senior Unsecured Notes Outstanding

July 2003 Senior Notes

In July 2003, the company completed the sale of $300 million of senior unsecured notes. A summary of the aggregate amount of these outstanding notes at March 31, is as follows:

 

(In thousands, except weighted average data)

      2014        2013       

Aggregate debt outstanding

    $         35,000        175,000     

Weighted average remaining life in years

      1.3        0.7     

Weighted average coupon rate on notes outstanding

      4.61 %      4.47 %   

Fair value of debt outstanding

      36,018        178,227