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Indebtedness - Consolidated Leverage Ratio (Details) - Loan	Dec. 19, 2017	Sep. 01, 2015
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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