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Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Parenthetical) (Details)
Jun. 30, 2017
Dec. 31, 2016
2.875% Senior notes due October 1, 2022    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Interest rate of debt 2.875% 2.875%
2.875% Senior notes due October 1, 2022 | Fair Value, Inputs, Level 2    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Interest rate of debt 2.875% 2.875%
2.45% Senior notes due December 15, 2019    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Interest rate of debt 2.45% 2.45%
2.45% Senior notes due December 15, 2019 | Fair Value, Inputs, Level 2    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Interest rate of debt 2.45% 2.45%