Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2019

Equity [Abstract]

Schedule of Common Stock Outstanding Roll Forward

The changes in shares of Common and Treasury Stock are as follows:

(in thousands)	Common Shares Issued	Treasury Stock Shares		Common Shares Outstanding
Balance as of January 1, 2019	19,067	429		18,638
Net shares issued for Stock awards	—	(137	)	137
Shares issued to Weichai *	4,050	—		4,050
Balance as of June 30, 2019	23,117	292		22,825

* See Note 3.Weichai Transactionsfor additional information.