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Commitments and contingencies
 12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Commitments and contingencies
Contingencies
Changes in provisions during the presented periods are summarized below:
 
Provision for employee- related litigation

Provision for tax- related litigation

Other provisions

Total

 
(in thousands)
Balance at January 1, 2015
$
781

$
592

$
—

$
1,373

Charges
200

44

388

632

Provision used
(487
)
—

—

(487
)
Provision released not used
(186
)
(541
)
—

(727
)
Currency translation adjustments
(72
)
(51
)
—

(123
)
Balance at January 1, 2016
$
236

$
44

$
388

$
668

Charges
671

—

166

837

Provision used
(402
)
—

(48
)
(450
)
Provision released not used
—

(44
)
(347
)
(391
)
Currency translation adjustments
(20
)
—

10

(10
)
Balance at December 31, 2016
$
485

$
—

$
169

$
654

 - of which current
$
485

$
—

$
169

$
654


The amount of the provisions represent management’s best estimate of the future outflow. Provisions are mainly in relation to employee-related litigation and other provisions which consist of estimated restoration costs following the end of leases in 2015 and 2016. The remaining provision was for tax contingencies relating to a tax inspection covering the fiscal years 2008 and 2009, which released upon receipt of the tax notification as of December 31, 2015.
Commitments and contingencies
Operating Lease Arrangements
Future payment obligations under non-cancellable operating leases as of December 31, 2016 are listed below:
 
Less than 1 year
 
1 to 5 years
 
5 years +
 
Total
 
 
 
(in thousands)
 
 
 
 
 
 
 
 
Minimum payments for property leases
$
33,655


$
98,938


$
49,551

 
$
182,144

Minimum payments for hosting services
50,959


48,927


—

 
99,886

Minimum payments for other leases
$
4,197


$
4,912


$
—

 
$
9,109


Operating Lease Expenses
Operating lease expenses relating to our offices totaled $32.1 million, $23.6 million and $18.8 million for the years ended December 31, 2016, 2015, and 2014, respectively.
Operating lease expenses relating to hosting services totaled $42.0 million, $30.4 million, and $24.8 million for the years ended December 31, 2016, 2015, and 2014, respectively.
Revolving Credit Facilities, Credit Lines Facilities and Bank Overdrafts
As mentioned in Note 14, we are party to three RCFs including one with BPI France, for which we can draw up to €1.0 million ($1.1 million), one with HSBC for which we can draw up to RMB 40.0 million ($5.8 million), and one with a syndicate of banks which allow us to draw up to €250.0 million ($263.5 million). As of December 31, 2016, €0.1 million ($0.1 million), RMB 30.0 million ($4.3 million), and $75.0 million had been drawn, respectively.
All of these credit facilities are unsecured and contain customary events of default but do not contain any affirmative, financial or negative covenants, with the exception of the €250.0 million ($263.5 million) RCF which contains covenants, including compliance with a total net debt to adjusted EBITDA ratio and restrictions on incurring additional indebtedness. At December 31, 2016, we were in compliance with the required leverage ratio.
We are also party to short-term credit lines and overdraft facilities with HSBC plc, and LCL. We are authorized to draw up to a maximum of €9.4 million ($9.9 million) in the aggregate under the short-term credit lines and overdraft facilities. As of December 31, 2016, we had not drawn on any of these facilities. Any loans or overdraft under these short-term facilities bear interest based on the one month EURIBOR rate or three month EURIBOR rate. As these facilities are exclusively short-term credit and overdraft facilities, our banks have the ability to terminate such facilities on short notice.

Contingencies
From time to time we may become involved in legal proceedings or be subject to claims arising in the ordinary course of our business. We are not presently a party to any legal proceedings that, if determined adversely to us, would individually or taken together have a material adverse effect on our business, results of operations, financial condition or cash flows. Regardless of the outcome, litigation can have an adverse impact on us because of defense and settlement costs, diversion of management resources and other factors.