Share-Based Compensation and Equity - Restricted Stock Unit Activity (Details) - Restricted Stock Units [Member] - $ / shares shares in Thousands		12 Months Ended
		Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Restricted Stock Units
Unvested, Shares, Beginning balance		900
Forfeited, Shares		(100)
Vested, Shares		(200)
Granted, Shares	[1]	600
Unvested, Shares, Ending balance		1,200		900
Unvested, Weighted-average grant-date fair value, Beginning balance		$ 32.53
Forfeited, Weighted-average grant-date fair value		31.40
Vested, Weighted-average grant-date fair value		31.62
Granted, Weighted-average grant-date fair value		26.77	[1]	$ 32.74	$ 35.25
Unvested, Weighted-average grant-date fair value, Ending balance		$ 29.50		$ 32.53
One year vest [Member]
Restricted Stock Units
Granted, Shares		41
Minimum | One year vest [Member]
Restricted Stock Units
Granted, Weighted-average grant-date fair value		$ 27.42

[1] (1) The RSUs granted during the year ended December 31, 2016 include 41 thousand 1-year RSUs to non-employee directors under the 1991 Plan. These RSUs have a weighted-average grant-date fair value of $27.42