Capital Stock (Details)							3 Months Ended								12 Months Ended
	Feb. 14, 2017 $ / shares	Feb. 03, 2017 USD ($) $ / shares	Jan. 02, 2017 $ / shares	Apr. 28, 2015 $ / shares shares	Apr. 09, 2015 USD ($) $ / shares	Mar. 05, 2015 $ / shares	Dec. 31, 2016 USD ($) $ / shares shares	Sep. 30, 2016 USD ($) $ / shares	Jun. 30, 2016 USD ($) $ / shares	Mar. 31, 2016 USD ($) $ / shares	Dec. 31, 2015 USD ($) $ / shares shares	Sep. 30, 2015 USD ($) $ / shares	Jun. 30, 2015 USD ($) $ / shares	Mar. 29, 2015 USD ($) $ / shares	Dec. 31, 2016 USD ($) registration $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 28, 2014 USD ($) $ / shares shares	Feb. 24, 2016 USD ($)	Oct. 13, 2014 USD ($)	Dec. 29, 2013 shares	Dec. 31, 2012 USD ($) $ / shares shares
Class of Stock [Line Items]
Treasury stock issued, shares							14,102,453				7,670,216				14,102,453	7,670,216
Preferred stock authorized for issuance, shares							40,000,000				40,000,000				40,000,000	40,000,000
Preferred stock par value (usd per share) | $ / shares							$ 0.001				$ 0.001				$ 0.001	$ 0.001
Registration Rights Agreement, Demand Registration, Holder Rights Percentage																					5.00%
Registration Rights Agreement, Aggregate Proceeds Expected to be Received, Benchmark Amount | $																					$ 100,000,000
Registration Rights Agreement, Registration Payment Percent of Market Capitalization																					2.50%
Treasury stock acquired, shares															6,432,455.000	6,569,056	1,101,160
Treasury stock acquired, value | $															$ 232,065,000	$ 332,339,000	$ 67,814,000
Treasury stock acquired, price per share | $ / shares															$ 36.08	$ 50.59	$ 61.58
Treasury stock placed in trades and settled in 2015, shares																	125,566
Treasury stock placed in trades and settled in 2015 | $																	$ 8,000,000
Common stock dividends | $							$ 21,612,000	$ 22,510,000	$ 22,959,000	$ 23,215,000	$ 23,555,000	$ 23,620,000	$ 24,100,000	$ 0	$ 90,296,000	$ 71,275,000
Oaktree Group
Class of Stock [Line Items]
Number of demand registrations | registration															5
JP Morgan
Class of Stock [Line Items]
Number of demand registrations | registration															3
Angelo Gordon & Co. LP
Class of Stock [Line Items]
Number of demand registrations | registration															3
Special Cash Dividend
Class of Stock [Line Items]
Dividends declared (usd per share) | $ / shares						$ 6.73									$ 0	$ 6.73	$ 0
Common Stock, Dividends, Per Share, Cash Paid | $ / shares					$ 6.73
Common stock dividends | $					$ 649,000,000											$ 648,644,000
Special Cash Dividend | Subsequent Event
Class of Stock [Line Items]
Dividends declared (usd per share) | $ / shares			$ 5.77
Common Stock, Dividends, Per Share, Cash Paid | $ / shares		$ 5.77
Common stock dividends | $		$ 499,000,000
Regular Cash Dividend
Class of Stock [Line Items]
Dividends declared (usd per share) | $ / shares							$ 0.25	$ 0.25	$ 0.25	$ 0.25	$ 0.25	$ 0.25	$ 0.25	$ 0	$ 1.0	$ 0.75	$ 0
Regular Cash Dividend | Subsequent Event
Class of Stock [Line Items]
Dividends declared (usd per share) | $ / shares	$ 0.25
Warrant
Class of Stock [Line Items]
Warrants issued, shares							128,232								128,232						16,789,972
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares																					$ 0.001
Common Class A
Class of Stock [Line Items]
Common stock issued, shares							100,416,516				100,015,546				100,416,516	100,015,546	95,708,000			89,934,000	78,754,269
Common Stock, Conversion Ratio															1
Common stock converted, shares issued																2,432,478	772,042
Class Of Warrant Or Right, Number of Warrants Exercised															163,077	1,718,652	4,875,048
Warrant exercises, shares															163,077	1,718,645	4,850,072
Common stock authorized for issuance, shares							1,000,000,000				1,000,000,000				1,000,000,000	1,000,000,000
Common stock par value (usd per share) | $ / shares							$ 0.001				$ 0.001				$ 0.001	$ 0.001
Shares Sold During Public Offering, Including Existing Shareholders				9,240,073
Shares Issued, Price Per Share | $ / shares				$ 56.00
Outstanding common stock authorized for repurchase | $																		$ 400,000,000	$ 400,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $							$ 168,000,000								$ 168,000,000
Treasury Stock, Shares, Acquired Life to Date Under Program											7,670,216					7,670,216
Common Class A | Unrestricted Stock Awards
Class of Stock [Line Items]
Common stock issued, shares							16,898				9,536				16,898	9,536	5,682
Common Class B
Class of Stock [Line Items]
Common stock issued, shares							5,605				5,605				5,605	5,605	2,438,000			3,186,000	4,455,767
Common Stock, Conversion Ratio															1
Common stock conversion, shares															0	2,432,478	772,042
Warrant exercises, shares																	24,000
Common stock authorized for issuance, shares							1,000,000,000				1,000,000,000				1,000,000,000	1,000,000,000
Common stock par value (usd per share) | $ / shares							$ 0.001				$ 0.001				$ 0.001	$ 0.001
Preferred Stock
Class of Stock [Line Items]
Preferred stock authorized for issuance, shares							40,000,000								40,000,000