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Stock-based Compensation: Incentive Award Plan and Employee Stock Purchase Plan Stock-based Compensation: Incentive Award Plan and Employee Stock Purchase Plan (Tables)
12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
 
Year Ended December 31,
 
2015
 
2014
 
2013
Continuing operations
$
22,018

 
$
15,623

 
$
13,533

Discontinued operations

 
576

 
878

Total
$
22,018

 
$
16,199

 
$
14,411

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
A summary of the status of the Company’s unvested RSUs as of December 31, 2015 and changes during the year then ended are presented below:
 
 
 
Service Conditions
 
Performance and Service Conditions
 
Total
 
Weighted Average Grant-Date Fair Value Per Unit
Unvested RSUs outstanding at December 31, 2014
 
705,373

 
381,188

 
1,086,561

 
 
$
24.88

 
Granted
 
213,649

 
712,108

 
925,757

 
 
$
40.49

 
Market value share count adjustment for liability awards
 

 
18,619

 
18,619

 
 
$
35.09

 
Vested
 
(423,280
)
 
(204,936
)
 
(628,216
)
 
 
$
24.76

 
Forfeited
 
(30,373
)
 
(25,728
)
 
(56,101
)
 
 
$
31.38

 
Unvested RSUs outstanding at December 31, 2015
 
465,369

 
881,251

 
1,346,620

 
 
$
36.31

 
Unvested and expected to vest RSUs outstanding at December 31, 2015
 
437,699

 
826,620

 
1,264,319

 
 
$
36.05

 
Schedule of Other Share-based Compensation, Activity [Table Text Block]
The following table summarizes the balance of liability awards and changes during the years presented (in thousands):
 
 
2015
 
2014
 
2013
 
Balances of liability awards at beginning of year
 
$
1,453

 
$
2,500

 
$
2,000

 
Granted
 

 
500

 
1,000

 
Settled
 
(1,453
)
 
(1,497
)
 
(500
)
 
Canceled
 

 
(50
)
 

 
Balance of liability awards end of year
 
$

 
$
1,453

 
$
2,500

 
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
The following summarizes pricing and term information for options outstanding as of December 31, 2015:
 
 
Options Outstanding
 
 
Options Exercisable
 
 
 
 
 
 
 
Number Outstanding at
 
Weighted Average Remaining Contractual Life (years)
 
Weighted Average Exercise Price
 
Number Exercisable at
 
Weighted Average Exercise Price
Range of Exercise Prices
 
December 31, 2015
 
 
 
December 31, 2015
 
$
4.44

 
-
 
$
8.26

 
73,901

 
4.0
 
 
$
6.96

 
 
73,305

 
 
$
6.95

 
$
10.46

 
-
 
$
11.75

 
61,885

 
4.3
 
 
$
10.88

 
 
60,755

 
 
$
10.89

 
$
12.90

 
-
 
$
12.90

 
120,000

 
1.1
 
 
$
12.90

 
 
120,000

 
 
$
12.90

 
$
13.31

 
-
 
$
13.58

 
25,600

 
1.4
 
 
$
13.33

 
 
25,506

 
 
$
13.32

 
$
16.51

 
-
 
$
16.51

 
75,000

 
6.7
 
 
$
16.51

 
 
60,937

 
 
$
16.51

 
$
4.44

 
-
 
$
16.51

 
356,386

 
3.5
 
 
$
12.11

 
 
340,503

 
 
$
11.94

 
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table is a summary of stock option activity during 2015:
 
 
 
Incentive Stock Options
 
Non- Qualified Stock Options
 
Total
 
Weighted Average Exercise Price Per Share
 
Weighted Average Remaining Contractual
Term (Years)
 
Aggregate Intrinsic Value
Outstanding at December 31, 2014
 
4,267

 
690,614

 
694,881

 
$
11.33

 
 
3.5
 
 
$
15,189,000

Exercised
 
(4,267
)
 
(325,235
)
 
(329,502
)
 
$
10.54

 
 
 
 
 
 

Canceled
 

 
(8,993
)
 
(8,993
)
 
$
9.81

 
 
 
 
 
 

Outstanding at December 31, 2015
 

 
356,386

 
356,386

 
$
12.11

 
 
3.5
 
 
$
11,705,000

Vested and Expected to Vest at December 31, 2015
 

 
356,386

 
356,386

 
$
12.11

 
 
3.5
 
 
$
11,705,000

Exercisable at December 31, 2015
 

 
340,503

 
340,503

 
$
11.94

 
 
3.3
 
 
$
11,241,000

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
The table below presents the average fair value per share of shares purchased, and the compensation expense under the ESPP (dollars in thousands, except per share amounts):
Year Ended
December 31,
 
Average fair value per share
 
Shares
 
Expense
 
2015
 
$7.77
 
204,401
 
$
1,586

 
2014
 
$8.35
 
207,805
 
$
1,756

 
2013
 
$7.16
 
203,200
 
$
1,195