ACCOUNTS PAYABLE AND ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
ACCOUNTS PAYABLE AND ACCRUED LIABILITIES.
Accounts payable, principally trade	$ 115,061	$ 116,374
Accrued employee compensation costs	125,724	125,227
Customer deposits and other unearned income	33,253	42,641
Other accrued liabilities	80,890	68,520
Total	$ 354,928	$ 352,762