Stock-Based Compensation - PSUs (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015	Dec. 28, 2014
PSUs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Grants in period, shares	118		295		66
Grants in period, Weighted Average Fair Value	$ 31.45		$ 21.26		$ 68.10
Forfeitures in Period, shares	(47)		(8)		(17)
Forfeitures in Period, Weighted Average Fair Value	$ 33.73		$ 49.85		$ 64.89
Adjustment due to the Special Cash Dividend	24				12
Vested in period, shares	(184)		(56)
Vested and issued in period, Weighted Average Fair Value	$ 31.22		$ 65.06
Outstanding, shares	253	[1]	347	[1],[2]	107	43	[1]
Outstanding, Weighted Average Fair Value	$ 22.53	[1]	$ 27.23	[1],[2]	$ 65.50	$ 74.35
Outstanding and nonvested, Weighted Average Remaining Contractual Term (in years)	1 year 4 months 21 days	[1]	1 year 26 days	[1],[2]	7 months 13 days	1 year 4 months
PSU Dividend Equivalent Unit (DEU)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Grants in period, shares	5		10		3
Grants in period, Weighted Average Fair Value	$ 39.26		$ 37.50		$ 41.86
Forfeitures in Period, shares	(6)
Forfeitures in Period, Weighted Average Fair Value	$ 40.72
Dividend Equivalent Units Vested	(4)		(1)
Dividend Equivalent Unit Weighted Average Vested Fair Value	$ 32.50		$ 41.64

[1] (2) The weighted average fair value of outstanding PSUs reflect the adjustment for the respective special cash dividend

[2] (1) Represents shares of PSUs for which performance targets have been established and which are deemed granted under U.S. GAAP.