Stock Compensation Plans and Other Employee Benefit Plans (Summary of Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock Options Outstanding [Roll Forward]
Outstanding at beginning of the period		1,618,426	1,524,672	1,745,427
Granted		502,517	447,153	236,120
Options outstanding in acquired plans		16,364
Exercised		(273,411)	(176,009)	(371,826)
Forfeited or canceled		(312,162)	(177,390)	(85,049)
Outstanding at end of the period		1,551,734	1,618,426	1,524,672
Exercisable		720,580	941,741	1,097,836
Vested or expected to vest		1,534,045
Stock Options, Weighted Average Strike Price [Roll Forward]
Outstanding at beginning of the period		$ 43.00	$ 42.00	$ 42.31
Granted		44.36	46.38	38.01
Options outstanding in acquired plans		21.18
Exercised		42.82	33.32	40.46
Forfeited or canceled		52.53	52.55	44.12
Outstanding at end of the period		41.32	43.00	42.00
Exercisable		37.64	$ 43.35	$ 44.82
Vested or expected to vest		$ 41.28
Stock Options Additional Disclosures
Outstanding, Remaining Contractual Term	[1]	4 years 4 months 24 days	3 years 6 months	2 years 7 months 6 days
Outstanding, Intrinsic Value	[2]	$ 11,433	$ 9,303	$ 11,021
Exercisable, Remaining Contractual Term	[1]	3 years 1 month 6 days	2 years	1 year 6 months
Exercisable, Intrinsic Value	[2]	$ 8,045	$ 6,392	$ 6,165
Vested or expected to vest, Remaining Contractual Term	[1]	4 years 4 months 24 days
Vested or expected to vest, Intrinsic Value	[2]	$ 11,371

[1] Represents the weighted average contractual remaining life in years.

[2] Aggregate intrinsic value represents the total pretax intrinsic value (i.e., the difference between the Company’s stock price at year end and the option exercise price, multiplied by the number of shares) that would have been received by the option holders if they had exercised their options on the last day of the year. Options with exercise prices above the year end stock price are excluded from the calculation of intrinsic value. The intrinsic value will change based on the fair market value of the Company’s stock.