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Shareholders' Equity (Details)								12 Months Ended			91 Months Ended	134 Months Ended	150 Months Ended
	Nov. 09, 2016 $ / shares	May 24, 2016 USD ($) $ / shares	Oct. 29, 2015 $ / shares	May 19, 2015 $ / shares shares	Nov. 04, 2014 $ / shares	Jul. 16, 2014	May 02, 2014 $ / shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Jun. 02, 2016 USD ($) shares
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares) | shares								522,134	736,171	1,576,090			12,313,028
Aggregate price of shares repurchased since inception | $								$ 18,234,163	$ 20,139,954	$ 37,142,974			$ 160,578,953
Average price of shares repurchased since inception (per share) | $ / shares								$ 34.92	$ 27.36	$ 23.57			$ 13.04
Dividends declared (per share) | $ / shares								$ 0.26	$ 0.24	$ 0.22
Stock split, conversion ratio						1.5
Cash dividends paid | $								$ 13,700,000	$ 12,700,000	$ 11,900,000
Regular Semi-Annual Dividend
Schedule of Shareholders' Equity [Line Items]
Dividends declared (per share) | $ / shares	$ 0.13	$ 0.13	$ 0.13	$ 0.11	$ 0.11		$ 0.11
2010 Stock Repurchase Program [Member]
Schedule of Shareholders' Equity [Line Items]
Stock repurchase program amount authorized (in shares) | shares				5,700,000.0										2,000,000.0
Stock repurchase program amount authorized, value | $		$ 25,000,000												$ 25,000,000
Stock repurchased during period (in shares) | shares								8,676	165,598	1,037,590	3,843,495
Aggregate price of shares repurchased since inception | $								$ 283,654	$ 4,440,658	$ 24,999,963	$ 61,232,115
Average price of shares repurchased since inception (per share) | $ / shares								$ 32.69	$ 26.82	$ 24.09	$ 15.93
2005 401(k) Stock Repurchase Program [Member]
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares) | shares								467,580	540,501	512,754			6,550,023
Aggregate price of shares repurchased since inception | $								$ 16,336,084	$ 14,875,850	$ 11,557,598			$ 82,068,805
Average price of shares repurchased since inception (per share) | $ / shares								$ 34.94	$ 27.52	$ 22.54			$ 12.53
2006 Director and Officer Repurchase Program [Member]
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares) | shares								45,878	30,072	25,746		1,919,510
Aggregate price of shares repurchased since inception | $								$ 1,614,425	$ 823,446	$ 585,413		$ 17,278,033
Average price of shares repurchased since inception (per share) | $ / shares								$ 35.19	$ 27.38	$ 22.74		$ 9.00

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