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Revenue Recognition - Historical Method (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Assets
Contracts in progress	$ 317,405		$ 317,405			$ 420,628
Deferred Income Taxes	84,868		84,868			86,740
Liabilities
Accrued liabilities – other	48,377		48,377			64,738
Advance billings on contracts	77,775		77,775			246,192
Stockholders' Equity
Retained earnings	1,097,665		1,097,665			990,652
Revenues	438,921	$ 410,011	896,384	$ 838,240
Cost of operations	318,209	278,356	645,573	581,572
Operating Income	71,549	85,428	151,437	161,700
Provision for Income Taxes	18,493	27,062	37,096	51,654
Net Income	60,734	$ 61,420	127,147	$ 117,206
Accounting Standards Update 2014-09
Assets
Contracts in progress	317,405		317,405		$ 260,932
Deferred Income Taxes	84,868		84,868		85,193
Liabilities
Accrued liabilities – other	48,377		48,377		66,371
Advance billings on contracts	77,775		77,775		73,390
Stockholders' Equity
Retained earnings	1,097,665		1,097,665		$ 1,000,578
Revenues	438,921		896,384
Cost of operations	318,209		645,573
Operating Income	71,549		151,437
Provision for Income Taxes	18,493		37,096
Net Income	60,734		127,147
Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09
Assets
Contracts in progress	348,762		348,762			420,628
Deferred Income Taxes	85,295		85,295			86,740
Liabilities
Accrued liabilities – other	45,572		45,572			64,738
Advance billings on contracts	121,902		121,902			246,192
Stockholders' Equity
Retained earnings	1,088,127		1,088,127			$ 990,652
Revenues	440,103		905,633
Cost of operations	319,945		654,487
Operating Income	70,995		151,772
Provision for Income Taxes	18,311		37,043
Net Income	$ 60,362		$ 127,535

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