Stock-Based Compensation Plans Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Options Shares [Abstract]
Outstanding at beginning of year	1,203,035
Granted	384,306
Exercised	(142,969)
Expired	(63,030)
Forfeited	(23,844)
Outstanding at end of year	1,357,498	1,203,035
Vested or expected to vest at end of year	1,352,575
Exercisable at end of year	648,248
Weighted Average Exercise Price [Abstract]
Beginning of year	$ 80.58
Granted	57.15
Exercised	55.58
Expired	70.01
Forfeited	77.71
End of year	77.12	$ 80.58
Vested or expected to vest at end of year	77.17
Exercisable at end of year	$ 84.47
Weighted Average Remaining Contractual Term, Outstanding at end of year	2 years 10 months 24 days
Weighted Average Remaining Contractual Term, Vested or expected to vest at end of year	2 years 10 months 24 days
Weighted Average Remaining Contractual Term, Exercisable at end of year	2 years
Aggregate Intrinsic Value, Outstanding at end of year	$ 6,027
Aggregate Intrinsic Value, Vested or expected to vest at end of year	5,977
Aggregate Intrinsic Value, Exercisable at end of year	$ 1,339
Weighted average grant date fair value of options	$ 17.37	$ 18.47	$ 18.90
Total intrinsic value of options exercised during the year	$ 1,600	$ 4,700	$ 20,900