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v3.8.0.1

Debt - Schedule of Ratio of Net Indebtedness (Details) - Line of Credit | 12 Months Ended
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Dec. 31, 2017
Less than or equal to 35% | Maximum |
Line Of Credit Facility Leverage Range [Line Items] |
Leverage Ratio | 0.35
Greater than 35% but less than or equal to 45% | Minimum |
Line Of Credit Facility Leverage Range [Line Items] |
Leverage Ratio | 0.35
Greater than 35% but less than or equal to 45% | Maximum |
Line Of Credit Facility Leverage Range [Line Items] |
Leverage Ratio | 0.45
Greater than 45% but less than or equal to 50% | Minimum |
Line Of Credit Facility Leverage Range [Line Items] |
Leverage Ratio | 0.45
Greater than 45% but less than or equal to 50% | Maximum |
Line Of Credit Facility Leverage Range [Line Items] |
Leverage Ratio | 0.5
Greater than 50% but less than or equal to 55% | Minimum |
Line Of Credit Facility Leverage Range [Line Items] |
Leverage Ratio | 0.5
Greater than 50% but less than or equal to 55% | Maximum |
Line Of Credit Facility Leverage Range [Line Items] |
Leverage Ratio | 0.55
Greater than 55% | Minimum |
Line Of Credit Facility Leverage Range [Line Items] |
Leverage Ratio | 0.55
LIBOR |
Line Of Credit Facility Leverage Range [Line Items] |
Applicable Margin | 1.50%
LIBOR | Less than or equal to 35% |
Line Of Credit Facility Leverage Range [Line Items] |
Applicable Margin | 1.50%
LIBOR | Greater than 35% but less than or equal to 45% |
Line Of Credit Facility Leverage Range [Line Items] |
Applicable Margin | 1.65%
LIBOR | Greater than 45% but less than or equal to 50% |
Line Of Credit Facility Leverage Range [Line Items] |
Applicable Margin | 1.80%
LIBOR | Greater than 50% but less than or equal to 55% |
Line Of Credit Facility Leverage Range [Line Items] |
Applicable Margin | 2.00%
LIBOR | Greater than 55% |
Line Of Credit Facility Leverage Range [Line Items] |
Applicable Margin | 2.25%

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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