Subsidiary Guarantors (Narrative) (Details) - Senior Notes	Dec. 09, 2015
2018 Senior Notes (3.000% coupon)
Debt Instrument, Interest Rate, Stated Percentage	3.00%	[1]
2020 Senior Notes (3.750% coupon)
Debt Instrument, Interest Rate, Stated Percentage	3.75%	[2]

[1] Instrument is callable by the Company at any time at the greater of 100% of the principal amount and the sum of the present values of the remaining scheduled payments of principal and interest discounted at the U.S. Treasury rate plus 0.30% plus, in each case, accrued and unpaid interest.

[2] Instrument is callable by the Company at any time prior to the date that is one month prior to the instrument’s maturity date at the greater of 100% of the principal amount and the sum of the present values of the remaining scheduled payments of principal and interest discounted at the U.S. Treasury rate plus 0.35% plus, in each case, accrued and unpaid interest. On or after such date, the instrument is callable by the Company at 100% of the principal amount plus accrued and unpaid interest.