Debt Facilities Debt Facilities - 2027 Senior Notes Redemption Rates (Details) - Senior Notes [Member] - 5.375% Senior Notes due 2027 [Member]	6 Months Ended
	Jun. 30, 2017
2022 [Member]
Debt Instrument [Line Items]
Redemption price, percentage	102.688%
2023 [Member]
Debt Instrument [Line Items]
Redemption price, percentage	101.792%
2024 [Member]
Debt Instrument [Line Items]
Redemption price, percentage	100.896%
2025 and thereafter [Member]
Debt Instrument [Line Items]
Redemption price, percentage	100.00%