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Stockholders' Equity (Tables)
 12 Months Ended
Mar. 31, 2015
Stockholders' Equity Note [Abstract]  
Summary of stock compensation amounts recognized in the consolidated statements of comprehensive income
The table below summarizes stock compensation amounts recognized in the consolidated statements of comprehensive income (loss):
 
Year ended
 
Quarter ended (transition period)
 
Years ended
 
3/31/2015
 
3/31/2014
 
12/31/2013
 
12/31/2012
Compensation expense recorded for:
 
 
 
 
 
 
 
NSUs
$
9,295

 
$
1,863

 
$
10,545

 
$
11,849

SARs
1,846

 
381

 
1,302

 
1,501

RSUs
1,323

 
354

 
287

 
231

Directors' shares
1,060

 
267

 
1,002

 
1,080

Total compensation expense
13,524

 
2,865

 
13,136

 
14,661

Income tax benefit recognized
(5,143
)
 
(1,082
)
 
(4,950
)
 
(5,573
)
Net compensation expense
$
8,381

 
$
1,783

 
$
8,186

 
$
9,088
Summary of the total remaining unrecognized compensation cost related to nonvested awards, that are considered probable of vesting and the weighted-average period over which the cost is expected to be recognized
The table below summarizes the total remaining unrecognized compensation cost related to nonvested awards that are considered probable of vesting as of March 31, 2015, and the weighted-average period over which the cost is expected to be recognized as of March 31, 2015:
 
Unrecognized
Compensation
Cost
 
Weighted-Average
Remaining
Vesting Period (Years)
NSUs
$
13,917

 
1.5
SARs
1,355

 
0.9
RSUs
6,317

 
1.5
Total
$
21,589

 
 
Summary of Nonvested Stock Units Issued Under the 2006 Plan
 
Number of
Shares
 
Weighted-
Average
Grant-Date
Fair Value
Nonvested at January 1, 2012
677,000

 
$
48.14

Granted
209,000

 
63.18

Vested
(297,000
)
 
35.90

Forfeited
(18,000
)
 
63.68

Cancelled*
(200,000
)
 
62.17

Nonvested at December 31, 2012
371,000

 
$
58.51

Granted
304,000

 
57.30

Vested
(315,000
)
 
53.19

Forfeited
(20,000
)
 
61.08

Nonvested at December 31, 2013
340,000

 
$
62.23

Granted
—

 
—

Vested
(2,000
)
 
58.11

Forfeited
(7,000
)
 
64.15

Nonvested at March 31, 2014
331,000

 
$
62.21

Granted
196,000

 
82.34

Vested
(142,000
)
 
68.39

Forfeited
(30,000
)
 
64.18

Cancelled*
(15,000
)
 
84.04

Nonvested at March 31, 2015
340,000

 
$
70.11


*     Nonvested Stock Units cancelled during the period represent awards granted whose performance criteria were not met.
Summary of Stock Appreciation Rights Issued Under the 2006 Plan
 
Number of
SARs
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term
(Years)
 
Aggregate
Intrinsic
Value
Outstanding at January 1, 2012
760,000

 
$
26.73

 
8.8
 
$
37,118

Granted
—

 
—

 
 
 
 
Exercised
(15,000
)
 
26.73

 
 
 
 
Forfeited
—

 
—

 
 
 
 
Outstanding at December 31, 2012
745,000

 
$
26.73

 
7.9
 
$
10,087

Granted
—

 
—

 
 
 
 
Exercised
(15,000
)
 
26.73

 
 
 
 
Forfeited
—

 
—

 
 
 
 
Outstanding at December 31, 2013
730,000

 
$
26.73

 
6.9
 
$
42,143

Granted
—

 
—

 
 
 
 
Exercised
—

 
—

 
 
 
 
Forfeited
—

 
—

 
 
 
 
Outstanding at March 31, 2014
730,000

 
$
26.73

 
6.7
 
$
38,690

Granted
—

 
—

 
 
 
 
Exercised
(15,000
)
 
26.73
 
 
 
 
Forfeited
—

 
—

 
 
 
 
Outstanding at March 31, 2015
715,000

 
$
26.73

 
5.8
 
$
32,990

Exercisable at March 31, 2015
190,000

 
$
26.73

 
2.1
 
$
8,767

Expected to vest and exercisable at March 31, 2015
702,000

 
$
26.73

 
5.8
 
$
32,396
Summary of Restricted Stock Units Issued Under the 2006 Plan
 
Number of
Shares
 
Weighted-
Average
Grant-Date
Fair Value
Nonvested at January 1, 2012
319,000

 
$
70.15

Granted
352,000

 
56.12

Vested
—

 
—

Forfeited
—

 
—

Nonvested at December 31, 2012
671,000

 
$
62.80

Granted
156,000

 
84.52

Vested
—

 
—

Forfeited
(32,000
)
 
63.69

Nonvested at December 31, 2013
795,000

 
$
67.03

Granted
—

 
—

Vested
—

 
—

Forfeited
(66,000
)
 
67.23

Nonvested at March 31, 2014
729,000

 
$
67.01

Granted
160,000

 
98.29

Vested
—

 
—

Forfeited
(35,000
)
 
78.39

Cancelled
(230,000
)
 
82.09
Nonvested at March 31, 2015
624,000

 
$
68.82