Significant Accounting Policies - Schedule of Basic Weighted Average Shares Reconciles to Diluted Weighted Average Shares Outstanding (Details) - shares shares in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Basic weighted average common shares outstanding (in shares)	75,817	75,352	75,171	75,740	75,779	75,698	75,460	75,442	75,741	75,594	76,412
Dilutive effect of stock options, restricted stock and performance share units (in shares)									659	860	1,151
Diluted weighted average common shares outstanding (in shares)	76,367	75,960	75,937	76,452	76,570	76,577	76,387	76,284	76,400	76,454	77,563