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Indebtedness - Consolidated Leverage Ratio (Details) - Loan | Dec. 19, 2017 | Sep. 01, 2015
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Line of credit | LIBOR | Greater than or equal to 3.00 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Fee percentage | 2.00% |
Line of credit | LIBOR | Greater than or equal to 3.00 to 1.0 | Minimum |  |
Line of Credit Facility [Line Items] |  |
Consolidated leverage ratio |  | 3
Line of credit | LIBOR | Between 2.00 to 1.0 and 3.00 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Fee percentage | 1.75% |
Line of credit | LIBOR | Between 2.00 to 1.0 and 3.00 to 1.0 | Minimum |  |
Line of Credit Facility [Line Items] |  |
Consolidated leverage ratio |  | 2
Line of credit | LIBOR | Between 2.00 to 1.0 and 3.00 to 1.0 | Maximum |  |
Line of Credit Facility [Line Items] |  |
Consolidated leverage ratio |  | 3
Line of credit | LIBOR | Between 1.50 to 1.0 and 2.00 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Fee percentage | 1.50% |
Line of credit | LIBOR | Between 1.50 to 1.0 and 2.00 to 1.0 | Minimum |  |
Line of Credit Facility [Line Items] |  |
Consolidated leverage ratio |  | 1.5
Line of credit | LIBOR | Between 1.50 to 1.0 and 2.00 to 1.0 | Maximum |  |
Line of Credit Facility [Line Items] |  |
Consolidated leverage ratio |  | 2
Line of credit | LIBOR | Between 1.00 to 1.0 and 1.50 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Fee percentage | 1.375% |
Line of credit | LIBOR | Between 1.00 to 1.0 and 1.50 to 1.0 | Minimum |  |
Line of Credit Facility [Line Items] |  |
Consolidated leverage ratio |  | 1
Line of credit | LIBOR | Between 1.00 to 1.0 and 1.50 to 1.0 | Maximum |  |
Line of Credit Facility [Line Items] |  |
Consolidated leverage ratio |  | 1.5
Line of credit | ABR Loans | Greater than or equal to 3.00 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Fee percentage | 1.00% |
Line of credit | ABR Loans | Between 2.00 to 1.0 and 3.00 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Fee percentage | 0.75% |
Line of credit | ABR Loans | Between 1.50 to 1.0 and 2.00 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Fee percentage | 0.50% |
Line of credit | ABR Loans | Between 1.00 to 1.0 and 1.50 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Fee percentage | 0.375% |
Domestic revolving credit facility | Greater than or equal to 3.00 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Commitment fee percentage | 0.35% |
Domestic revolving credit facility | Between 2.00 to 1.0 and 3.00 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Commitment fee percentage | 0.30% |
Domestic revolving credit facility | Between 1.50 to 1.0 and 2.00 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Commitment fee percentage | 0.275% |
Domestic revolving credit facility | Between 1.00 to 1.0 and 1.50 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Commitment fee percentage | 0.25% |
Revolving credit facility | Greater than or equal to 3.00 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Commitment fee percentage | 0.35% |
Revolving credit facility | Between 2.00 to 1.0 and 3.00 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Commitment fee percentage | 0.30% |
Revolving credit facility | Between 1.50 to 1.0 and 2.00 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Commitment fee percentage | 0.275% |
Revolving credit facility | Between 1.00 to 1.0 and 1.50 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Commitment fee percentage | 0.25% |
Letter of credit | Greater than or equal to 3.00 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Fee percentage | 2.00% |
Letter of credit | Between 2.00 to 1.0 and 3.00 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Fee percentage | 1.75% |
Letter of credit | Between 1.50 to 1.0 and 2.00 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Fee percentage | 1.50% |
Letter of credit | Between 1.00 to 1.0 and 1.50 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Fee percentage | 1.375% |
Foreign credit instrument facility | Greater than or equal to 3.00 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Commitment fee percentage | 0.35% |
Fee percentage | 1.25% |
Foreign credit instrument facility | Between 2.00 to 1.0 and 3.00 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Commitment fee percentage | 0.30% |
Fee percentage | 1.00% |
Foreign credit instrument facility | Between 1.50 to 1.0 and 2.00 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Commitment fee percentage | 0.275% |
Fee percentage | 0.875% |
Foreign credit instrument facility | Between 1.00 to 1.0 and 1.50 to 1.0 |  |
Line of Credit Facility [Line Items] |  |
Commitment fee percentage | 0.25% |
Fee percentage | 0.80% |

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