Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands |
3 Months Ended |
9 Months Ended |
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
|
|
|
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |
551
|
0
|
938
|
0
|
| Net Income (Loss) Attributable to Parent [Abstract] |
|
|
|
|
| Net income attributable to common stockholders |
$ 47,727
|
$ 47,448
|
$ 110,792
|
$ 161,418
|
| After tax interest on convertible debt |
13
|
13
|
35
|
37
|
| Net income — diluted |
$ 47,740
|
$ 47,461
|
$ 110,827
|
$ 161,455
|
| Weighted average shares (denominator): |
|
|
|
|
| Weighted average shares — basic |
(193,274)
|
(199,310)
|
(193,999)
|
(201,729)
|
| Convertible debt |
121
|
121
|
121
|
121
|
| Weighted average shares — diluted |
196,567
|
203,444
|
197,175
|
205,950
|
| Net income attributable to common stockholders, basic |
$ 0.25
|
$ 0.24
|
$ 0.57
|
$ 0.80
|
| Net income attributable to common stockholders, diluted |
$ 0.24
|
$ 0.23
|
$ 0.56
|
$ 0.78
|
| Equity Option [Member] |
|
|
|
|
| Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |
|
|
|
|
| Stock options |
3,154
|
4,013
|
3,049
|
4,100
|
| Restricted Stock Units (RSUs) [Member] |
|
|
|
|
| Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |
|
|
|
|
| Stock options |
18
|
0
|
6
|
0
|
| Equity Option [Member] |
|
|
|
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
|
|
|
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |
551
|
0
|
936
|
0
|
| Restricted Stock Units (RSUs) [Member] |
|
|
|
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
|
|
|
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |
0
|
0
|
2
|
0
|