Guarantor Obligations, Maximum Exposure, Number Of Office Leases

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Number of irrevocable undertakings (typically by a financial institution) held at period end to guarantee payment of a specified financial obligation.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Contractually required future rental payments receivable on noncancelable subleasing arrangements.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Amount of sublease income excluding finance and operating lease expense.

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COMMITMENTS, CONTINGENCIES AND REGULATORY MATTERS (Details 2) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) office_lease letter_of_credit	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Operating Lease Obligations
Total operating lease expense, net of sublease income	$ 19,900	$ 19,000	$ 17,600
Sublease income	1,600	$ 1,300	$ 500
Future minimum payments due, sublease rentals	2,800
Operating lease obligations
2019	17,600
2020	14,137
2021	9,849
2022	5,558
2023	3,441
Thereafter	1,323
Operating lease obligations	$ 51,908
Financial Standby Letter of Credit
Operating Lease Obligations
Standby letters of credit, number \| letter_of_credit	5
Standby letters of credit, amount	$ 3,100
Number of office leases \| office_lease	4
Minimum
Operating Lease Obligations
Customary lease term	1 year
Maximum
Operating Lease Obligations
Customary lease term	10 years