Share-based Compensation and Equity (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of share-based compensation expense

Share-based compensation expense was as follows:

For the years ended December 31,	2018			2017		2016
Continuing operations
Stock options, net of estimated forfeitures	$	(3,026	)	$	48,601	$	25,008
Restricted stock awards	12,764			13,243		10,106
Total non-cash stock compensation	9,738			61,844		35,114
Deferred compensation arrangement	—			—		738
Total continuing operations	$	9,738		$	61,844	$	35,852
Discontinued operations
Share-based compensation expense for discontinued operations	1,053			2,944		2,957
Total continuing and discontinued operations	$	10,791		$	64,788	$	38,809

Summary of stock options activity

The following tables summarize the stock option activity and the assumptions used to record the related share-based compensation expense for the years ended December 31, 2018, 2017 and 2016:

	2018						2017						2016
	Options		Weighted Average Exercise Price		Aggregate Intrinsic Value		Options		Weighted Average Exercise Price		Aggregate Intrinsic Value		Options		Weighted Average Exercise Price		Aggregate Intrinsic Value
Outstanding at January 1	9,903		$	19.30	$	—	10,928		$	21.81	$	4,350	11,427		$	26.12	$	20,339
Granted	717		$	14.27			4,283		$	19.01			303		$	23.29
Exercised	—		$	—	$	—	—		$	—	$	—	(245	)	$	19.57	$	899
Forfeited or expired	(1,600	)	$	19.92			(5,308	)	$	18.34			(557	)	$	23.78
Outstanding at December 31	9,020		$	18.79	$	744	9,903		$	19.30	$	—	10,928		$	21.81	$	4,350
Exercisable at December 31	7,878		$	19.11	$	265	8,606		$	19.38	$	—	9,004		$	21.48	$	4,350
Vested and expected to vest	8,990		$	18.80	$	722	9,847		$	19.31	$	—	10,790		$	21.79	$	4,350

Summary of stock option plans, by exercise price range

	Options Outstanding		Options Exercisable		Assumption Range*
Exercise Prices	Number of Shares	Weighted Average Remaining Contractual Terms (Years)	Number of Shares	Weighted Average Remaining Contractual Terms (Years)	Risk-Free Interest Rate	Expected Terms in Years	Expected Volatility
Year Ended December 31, 2018
$13.97 - $15.55	674	8.31	250	7.98	1.81% - 3.05%	3.25 - 5.91	49.98% - 64.18%
$17.00- $19.56	5,730	3.69	5,013	3.50	0.49% - 2.94%	2.60 - 10.00	36.04% - 69.74%
$21.00 - $21.52	1,917	1.39	1,916	1.39	0.68% - 2.60%	2.92 - 6.52	38.16% - 69.74%
$22.32 - $31.92	699	2.53	699	2.53	0.60% - 2.93%	4.00 - 6.52	36.93% - 53.80%
Year Ended December 31, 2017
$14.58 - $19.56	6,500	4.58	5,549	4.22	0.33% - 3.31%	2.03 -10.00	32.18% - 69.74%
$21.00 - $21.28	693	2.18	347	0.66	0.43% - 3.60%	2.11 - 6.67	33.24% - 57.79%
$21.32 - $21.52	1,776	2.14	1,776	2.14	0.68% - 2.61%	3.38 - 6.55	38.16% - 69.74%
$21.68 - $22.32	221	1.94	221	1.94	0.57% - 3.03%	2.18 - 6.52	36.78% - 52.47%
$22.88 - $31.92	713	3.76	713	3.76	0.73% - 2.86%	4.00 - 6.52	39.03% - 53.80%
Year Ended December 31, 2016
$18.36 - $19.56	3,601	0.80	3,601	0.80	0.32% - 4.20%	1.90 - 6.95	26.85% - 52.47%
$20.16 - $21.28	353	1.66	353	1.66	0.42% - 3.60%	2.11 - 6.52	33.24% - 52.47%
$21.48 - $21.52	438	3.81	438	3.81	0.68% - 2.63%	3.38 - 6.58	38.16% - 52.47%
$21.68 - $22.32	320	3.10	320	3.10	0.57% - 3.03%	2.18 - 6.52	36.78% - 52.47%
$22.40 - $31.92	6,216	7.07	4,291	6.71	0.73% - 2.86%	4.00 - 7.12	39.03% - 58.84%

* The expected dividend yield is zero for all options in all years.

Summary of non-vested restricted stock and restricted stock units activity

The following table summarizes the non-vested restricted stock and restricted stock units activity for the years ended December 31, 2018, 2017 and 2016:

	2018				2017				2016
	Shares		Weighted Average Grant Date Fair Value		Shares		Weighted Average Grant Date Fair Value		Shares		Weighted Average Grant Date Fair Value
Non-vested at January 1	1,650		$	19.74	1,038		$	25.97	865		$	29.60
Granted	1,306		$	14.11	1,337		$	16.65	655		$	23.27
Vested	(853	)	$	21.66	(328	)	$	22.35	(386	)	$	29.36
Forfeited	(208	)	$	17.41	(397	)	$	23.33	(96	)	$	26.51
Non-vested at December 31	1,895		$	15.31	1,650		$	19.74	1,038		$	25.97