Earnings Per Share - Reconciliation of Shares Used in Calculating Earnings Per Basic and Diluted Shares (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Weighted average common shares outstanding—basic (in shares)	25,983,000	25,742,000	25,930,000	25,646,000
Dilutive effect of stock-based awards (in shares)	160,000	132,000	186,000	225,000
Dilutive effect of convertible senior notes (in shares)	248,000	0	124,000	0
Weighted average common shares outstanding—diluted (in shares)	26,391,000	25,874,000	26,240,000	25,871,000
Antidilutive securities excluded from computation of earnings per share, amount	317,000		200,000