Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Summary of depreciable lives by class of assets

The depreciable lives that are used in computing the annual provision for depreciation by class of asset are primarily as follows:



	Years
Land improvements	10 to 20
Buildings	20 to 40
Leasehold improvements	Life of lease
Machinery and equipment	3 to 15
Furniture and fixtures	4 to 10
Automobiles and trucks	3 to 8
Research equipment	3 to 10
Computer hardware	3 to 10
Computer software	3 to 10

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

The new standard primarily impacted the Company's timing of revenue recognition for certain contracts and subcontracts with the United States (U.S.) government that contain termination for convenience clauses, and due to the cumulative impact of adopting ASC 606, the Company recorded an increase to beginning retained earnings of $0.4 million, net of tax as summarized below:



(Thousands)	December 31, 2017		Adjustments due to ASC 606			January 1, 2018
Assets
Unbilled receivables	$	—	$	2,658		$	2,658
Inventories	220,352		(2,059		)	218,293

Liabilities and Shareholders’ Equity
Other liabilities and accrued items	$	28,044	61			28,105
Deferred income taxes	213		113			326
Retained earnings	536,116		425			536,541