Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Stock repurchased during period	$ (10,738)	$ (14,483)	$ (24,779)
Preferred Stock [Member]
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock, shares authorized (in shares)	500,000
Preferred stock, par value (in dollars per share)	$ 20
Preferred stock, shares outstanding (in shares)	0	0
Series A Preferred Stock [Member]
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock, shares authorized (in shares)	30,000
Preferred stock, voting rights	Each share of the Series A Preferred Stock shall entitle the holder to one thousand votes
Stock Repurchase Program 2017 [Member]
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Stock repurchase program, authorized amount			$ 30,000
Stock repurchased during period (in shares)		(112,307)	(539,760)
Stock repurchased during period		$ (5,200)	$ (24,800)
Stock Repurchase Program 2018 [Member]
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Stock repurchase program, authorized amount		$ 20,000
Stock repurchased during period (in shares)	(221,748)	(201,484)
Stock repurchased during period	$ (10,700)	$ (9,300)