Stock-Based Incentive Plans - Disclosure of Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Forfeited, weighted average grant date fair value	$ 101.55	$ 0.00
Pre-tax compensation expense	$ 8,600	$ 11,800	$ 10,300
Stock-based compensation expense related to LTIP awards	(400)	2,400	$ 900
Accrued employee compensation and benefits	$ 25,085	$ 25,722
Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Multiplier for target award based on total shareholder return on common stock	0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Multiplier for target award based on total shareholder return on common stock	200.00%
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Beginning of period	(233,818)	(61,048)	(346,563)
Granted	138,518	266,252	97,812
Released	(77,042)	(94,798)	0
Forfeited	(37,700)	(40,254)	(117,075)
End of period	(257,594)	(233,818)	(61,048)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning of period, weighted average grant date fair value	$ 70.14	$ 55.37	$ 44.74
Granted, weighted average grant date fair value	102.78	58.87	73.11
Released, weighted average grant date fair value	(54.89)	(53.03)	(0.00)
Forfeited, weighted average grant date fair value	86.77	67.68	30.96
End of period, weighted average grant date fair value	$ 89.99	$ 70.14	$ 55.37
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Conversion Of Cash Settled Unit		102,618
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Conversion Of Cash Settled Units Weighted Average Grant Date Fair Value		$ 82.18
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Beginning of period	(41,622)	0	(33,242)
Granted	10,630	47,230	15,804
Released	(16,567)	(19,487)	37,184
Forfeited	(569)	0	(39,000)
End of period	(35,116)	(41,622)	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning of period, weighted average grant date fair value	$ 66.92	$ 0.00	$ 41.19
Granted, weighted average grant date fair value	111.72	64.57	72.04
Released, weighted average grant date fair value	(52.19)	(70.82)	(72.28)
Forfeited, weighted average grant date fair value			54.66
End of period, weighted average grant date fair value	$ 86.30	$ 66.92	$ 0.00
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Conversion Of Cash Settled Unit		13,879
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Conversion Of Cash Settled Units Weighted Average Grant Date Fair Value		$ 81.65
Cash Settled Restricted Stock Units Classified as Liabilities | Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Pre-tax compensation expense			$ 300
LTIP
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Pre-tax compensation expense			$ 600
Award vesting period	3 years
Accrued employee compensation and benefits	$ 1,600	$ 4,000