Stock-Based Compensation Plans Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Options Outstanding [Abstract]
Outstanding at beginning of year	983,280
Granted	360,235
Exercised	(118,628)
Expired	(4,171)
Forfeited	(17,681)
Outstanding at end of year	1,203,035	983,280
Vested or expected to vest at end of year	1,199,470
Exercisable at end of year	566,815
Weighted Average Exercise Price [Abstract]
Beginning of year	$ 76.99
Granted	79.67
Exercised	45.74
Expired	87.49
Forfeited	94.97
End of year	80.58	$ 76.99
Vested or expected to vest at end of year	80.57
Exercisable at end of year	$ 73.28
Weighted Average Remaining Contractual Term, Outstanding at end of year	3 years
Weighted Average Remaining Contractual Term, Vested or expected to vest at end of year	3 years
Weighted Average Remaining Contractual Term, Exercisable at end of year	1 year 10 months 24 days
Aggregate Intrinsic Value, Outstanding at end of year	$ 311
Aggregate Intrinsic Value, Vested or expected to vest at end of year	311
Aggregate Intrinsic Value, Exercisable at end of year	$ 311
Weighted average grant date fair value of options	$ 18.47	$ 18.90	$ 22.16
Total intrinsic value of options exercised during the year	$ 4,700	$ 20,900	$ 17,600