LONG-TERM DEBT, DERIVATIVES AND LETTERS OF CREDIT - Additional Information (Details) € in Millions	9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2016 EUR (€)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Line of Credit Facility [Line Items]
Borrowing capacity	$ 600,000,000
Commitment fee percentage	0.40%
Maximum ratio of consolidated funded debt to consolidated EBITDA	3.00	3.00
Decrease in ratio of consolidated funded debt to consolidated EBITDA	0.25
Maximum ratio of senior secured debt to consolidated EBITDA	3.00	3.00
Minimum interest coverage ratio	3.00	3.00
Cash on hand	$ 38,201,000		$ 44,825,000	$ 38,546,000	$ 44,426,000
Available borrowing capacity	35,000,000
Unamortized debt issuance costs	3,000,000
Net Investment Hedge
Line of Credit Facility [Line Items]
Borrowing under credit facility	$ 13,800,000	€ 12.3
LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.25%
Revolving Credit Facility
Line of Credit Facility [Line Items]
Borrowing capacity	$ 400,000,000
Debt term	5 years
Term Loan Facility
Line of Credit Facility [Line Items]
Borrowing capacity	$ 200,000,000
Debt term	5 years
Swing Line Facility
Line of Credit Facility [Line Items]
Borrowing capacity	$ 35,000,000
Standby Letters of Credit
Line of Credit Facility [Line Items]
Outstanding letter of credit	$ 22,200,000		$ 13,200,000
September 30, 2016
Line of Credit Facility [Line Items]
Maximum ratio of consolidated funded debt to consolidated EBITDA	4.25	4.25
December 31, 2016
Line of Credit Facility [Line Items]
Maximum ratio of consolidated funded debt to consolidated EBITDA	4.50	4.50
March 31, 2017
Line of Credit Facility [Line Items]
Maximum ratio of consolidated funded debt to consolidated EBITDA	4.25	4.25
June 30, 2016
Line of Credit Facility [Line Items]
Maximum ratio of consolidated funded debt to consolidated EBITDA	4.25	4.25
September 30, 2017
Line of Credit Facility [Line Items]
Maximum ratio of consolidated funded debt to consolidated EBITDA	3.75	3.75