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ACCOUNTING POLICIES (Adopted Pronouncements) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2016
Adopted Accounting Pronouncements      
Noncurrent deferred tax assets $ 5,965   $ 2,978
Noncurrent deferred tax liabilities 49,157   54,680
Retained earnings 438,379   386,917
Additional paid-in capital $ 319,436   315,318
ASC Topic 740, Balance Sheet Classification of Deferred Taxes | Adjustment      
Adopted Accounting Pronouncements      
Current deferred tax assets     (39,600)
Noncurrent deferred tax assets     3,000
Noncurrent deferred tax liabilities     $ (36,600)
ASC Topic 718, Compensation – Stock Compensation | Adjustment      
Adopted Accounting Pronouncements      
Noncurrent deferred tax liabilities   $ (200)  
Retained earnings   (200)  
Additional paid-in capital   $ 400