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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Changes in valuation and qualifying accounts      
Removal of tax valuation allowance for expiration of net operating loss carryforwards     $ 3,000
Removal of tax valuation allowance for Utilization of foreign tax credits     27,000
Allowance for doubtful accounts      
Changes in valuation and qualifying accounts      
Balance at beginning of period $ 2,339 $ 4,564 10,877
Charged (credited) to costs and expenses (56) 1,564 103
Credited to other accounts 154    
(Deductions) Adjustments   (3,789) (6,416)
Balance at end of period 2,437 2,339 4,564
Tax valuation allowance      
Changes in valuation and qualifying accounts      
Balance at beginning of period 329,523 328,397 368,672
Charged (credited) to costs and expenses 6,162 (3,016) (11,090)
Credited to other accounts   4,142 (29,185)
(Deductions) Adjustments (99,353)    
Balance at end of period $ 236,332 $ 329,523 $ 328,397