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Credit Risk and Fair Value of Financial Instruments Level 4 (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Bank credit facility   $ 500,000 $ 500,000
Notes Payable $ 3,753   4,047
Long-term Debt, Fair Value 3,240,560   3,101,760
May 2024 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Senior Notes 884,000   884,094
June 2017 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Senior Notes 0   314,618
October 2018 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Senior Notes 272,353   279,375
November 2020 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Senior Notes 205,000   201,500
November 2021 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Senior Notes 175,500   176,438
January 2022 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Senior Notes 444,614   445,188
April 2027 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Senior Notes 231,590   216,500
July 2018 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Bank credit facility 0   270,000
Term Loan 0   310,000
March 2021 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Bank credit facility 350,000   0
Term Loan $ 673,750   $ 0