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Revenue Recognition - Initial Impact of New Revenue Recognition Standard (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Assets      
Contracts in progress $ 317,405   $ 420,628
Deferred Income Taxes 84,868   86,740
Liabilities      
Accrued liabilities – other 48,377   64,738
Advance billings on contracts 77,775   246,192
Stockholders' Equity      
Retained earnings 1,097,665   990,652
Accounting Standards Update 2014-09      
Assets      
Contracts in progress 317,405 $ 260,932  
Deferred Income Taxes 84,868 85,193  
Liabilities      
Accrued liabilities – other 48,377 66,371  
Advance billings on contracts 77,775 73,390  
Stockholders' Equity      
Retained earnings 1,097,665 $ 1,000,578  
Accounting Standards Update 2014-09 | Calculated under Revenue Guidance in Effect before Topic 606      
Assets      
Contracts in progress 348,762   420,628
Deferred Income Taxes 85,295   86,740
Liabilities      
Accrued liabilities – other 45,572   64,738
Advance billings on contracts 121,902   246,192
Stockholders' Equity      
Retained earnings $ 1,088,127   $ 990,652