Stockholders' Equity (Narratives) (Details) - USD ($)			1 Months Ended	3 Months Ended	6 Months Ended
	Jan. 24, 2020	Nov. 07, 2019	Nov. 30, 2019	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2019	Nov. 02, 2018
Class Of Stock [Line Items]
Stock repurchase, authorized amount								$ 60,000,000.0
Maximum amount of common stock may be repurchased in calendar year							$ 35,000,000.0
Payment for intial delivery of shares					$ 25,179,000	$ 15,000,000
Equity forward contract				$ (4,821,000)	$ (4,821,000)
Accelerated Share Repurchase Agreement "November 2019"
Class Of Stock [Line Items]
Payment for intial delivery of shares			$ 30,000,000.0
Initial delivery of shares repurchased			3,850,000
Value of initial share delivery repurchased			$ 25,200,000
Equity forward contract			$ 4,800,000
Forward contract settlement date			Jan. 24, 2020
Additional shares of common stock received	381,505
2013 Equity Incentive Plan
Class Of Stock [Line Items]
Increase in authorized shares for issuance		7,000,000