Stockholders' Equity - Narrative (Details) - USD ($)			3 Months Ended		9 Months Ended
	Oct. 01, 2015	Jul. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Oct. 31, 2014
Equity, Class of Treasury Stock [Line Items]
Payments of dividends					$ 49,786,000	$ 42,733,000
Dividends declared per common share (USD per share)		$ 0.875	$ 0.875	$ 0.75	$ 2.625	$ 2.25
Dividends payable			$ 16,408,000		$ 16,408,000		$ 16,635,000
Treasury stock reissued (shares)					316,117
Treasury stock reissued					$ 11,500,000
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Dividends declared per common share (USD per share)	$ 0.92
Percent increase in dividend	5.00%
October 2014 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount								$ 100,000,000
Stock repurchased during period, shares					489,504
Stock repurchased during period, value					$ 50,000,000
Cumulative amount of shares repurchased			509,839		509,839
Cumulative payments for repurchase of common stock			$ 52,000,000		$ 52,000,000
Remaining authorized stock repurchases			$ 48,000,000		$ 48,000,000
October 2014 Share Repurchase Program | Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Remaining authorized stock repurchases	$ 150,000,000