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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
1 Percent Convertible Senior Notes [Member]          
Supplemental disclosures of non-cash investing and financing activities:          
Interest rate on convertible senior notes 1.00% 1.00% 1.00% 1.00% 1.00%
2 3/4 Percent Convertible Senior Notes [Member]          
Supplemental disclosures of non-cash investing and financing activities:          
Interest rate on convertible senior notes 2.75% 2.75% 2.75% 2.75% 2.75%