Stock-Based Incentive Plans - Disclosure of Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Liability classified awards (credit)	$ (1,000)	$ (500)	$ (400)
Accrued employee compensation and benefits	$ 13,547	$ 14,609
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 (shares)	235,472	257,594	233,818
Granted (shares)	216,269	88,797	138,518
Released (shares)	(92,968)	(77,712)	(77,042)
Forfeited (shares)	(83,582)	(33,207)	(37,700)
End of period (shares)	275,191	235,472	257,594
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	$ 92.91	$ 89.99	$ 70.14
Granted, weighted average grant date fair value	51.89	88.90	102.78
Released, weighted average grant date fair value	88.62	78.70	54.89
Forfeited, weighted average grant date fair value	79.52	92.82	86.77
End of period, weighted average grant date fair value	$ 66.10	$ 92.91	$ 89.99
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Beginning of period (shares)	34,058	35,116	41,622
Granted (shares)	281,973	13,053	10,630
Released (shares)	(12,683)	(14,027)	(16,567)
Forfeited (shares)	0	(84)	(569)
End of period (shares)	303,348	34,058	35,116
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	$ 93.95	$ 86.30	$ 66.92
Granted, weighted average grant date fair value	22.37	90.90	111.72
Released, weighted average grant date fair value	81.63	72.01	52.19
Forfeited, weighted average grant date fair value	0.00	101.25	101.55
End of period, weighted average grant date fair value	$ 28.39	$ 93.95	$ 86.30
LTIP
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Award vesting period	3 years
Accrued employee compensation and benefits	$ 200	$ 1,200