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Selected Quarterly Financial Data (Unaudited) - Restated Condensed Statements of Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Stockholders' Equity                          
Balance, value $ 1,822,664 $ 1,865,844 $ 1,865,806 $ 1,890,110 $ 1,786,040 $ 1,760,909 $ 1,865,806 $ 1,760,909 $ 1,865,806 $ 1,760,909 $ 1,865,806 $ 1,760,909 $ 1,675,841
Foreign currency translation adjustment 8,638 3,325 (7,745) (4,569) (2,206) 776 (4,420) (1,430) 4,218 (5,999) 2,415 (12,147) 7,566
Net income (loss) (7,839) (14,998) 39,970 42,036 18,713 32,763 24,972 51,476 17,133 93,512 (125,697) 88,661 126,606
Balance, value 1,792,272 1,822,664 1,865,844 1,905,324 1,890,110 1,786,040 1,822,664 1,890,110 1,792,272 1,905,324 787,259 1,865,806 1,760,909
Accumulated Other Comprehensive Income(Loss)                          
Statement of Stockholders' Equity                          
Balance, value 20,501 17,047 25,834 36,300 38,506 37,546 25,834 37,546 25,834 37,546 25,834 37,546 28,342
Foreign currency translation adjustment                     2,415 (12,147) 7,566
Balance, value 28,101 20,501 17,047 32,351 36,300 38,506 20,501 36,300 28,101 32,351 (1,570) 25,834 37,546
Accumulated Deficit                          
Statement of Stockholders' Equity                          
Balance, value (1,977,497) (1,942,918) (1,963,605) (1,963,529) (1,963,755) (1,984,231) (1,963,605) (1,984,231) (1,963,605) (1,984,231) (1,963,605) (1,984,231) (2,078,259)
Net income (loss)     31,027     30,465 6,851 40,692 (3,059) 74,620 (132,549) 60,945 94,028
Balance, value (1,997,831) (1,977,497) (1,942,918) (1,939,658) (1,963,529) (1,963,755) (1,977,497) (1,963,529) (1,997,831) (1,939,658) (2,137,738) (1,963,605) (1,984,231)
As Previously Reported                          
Statement of Stockholders' Equity                          
Balance, value 1,931,522 1,951,581 1,953,045 1,948,071 1,841,048 1,813,428 1,953,045 1,813,428 1,953,045 1,813,428 1,953,045 1,813,428 1,702,259
Foreign currency translation adjustment 4,949 3,659 (10,362) (6,250) (1,403) 1,134 (6,703) (269) (1,754) (6,519) (3,558) (14,648) 4,531
Net income (loss) (4,233) 7,789 41,085 42,158 20,863 34,894 48,874 55,757 44,641 97,915 (98,966) 125,882 155,742
Balance, value 1,901,047 1,931,522 1,951,581 1,961,726 1,948,071 1,841,048 1,931,522 1,948,071 1,901,047 1,961,726   1,953,045 1,813,428
As Previously Reported | Accumulated Other Comprehensive Income(Loss)                          
Statement of Stockholders' Equity                          
Balance, value 8,249 4,461 15,865 29,993 31,396 30,078 15,865 30,078 15,865 30,078 15,865 30,078 23,909
Foreign currency translation adjustment                     (3,558) (14,648) 4,531
Balance, value 12,160 8,249 4,461 24,363 29,993 31,396 8,249 29,993 12,160 24,363   15,865 30,078
As Previously Reported | Accumulated Deficit                          
Statement of Stockholders' Equity                          
Balance, value (1,856,387) (1,844,595) (1,866,397) (1,899,261) (1,901,637) (1,924,244) (1,866,397) (1,924,244) (1,866,397) (1,924,244) (1,866,397) (1,924,244) (2,047,408)
Net income (loss)     32,142     32,596 30,753 44,973 24,449 79,023 (105,818) 98,166 123,164
Balance, value (1,873,115) (1,856,387) (1,844,595) (1,875,268) (1,899,261) (1,901,637) (1,856,387) (1,899,261) (1,873,115) (1,875,268) (2,013,799) (1,866,397) (1,924,244)
Restatement Adjustment                          
Statement of Stockholders' Equity                          
Balance, value (108,858) (85,737) (87,239) (57,961) (55,008) (52,519) (87,239) (52,519) (87,239) (52,519) (87,239) (52,519) (26,418)
Foreign currency translation adjustment 3,689 (334) 2,617 1,681 (803) (358) 2,283 (1,161) 5,972 520 5,973 2,501 3,035
Net income (loss) (3,606) (22,787) (1,115) (122) (2,150) (2,131) (23,902) (4,281) (27,508) (4,403) (26,731) (37,221) (29,136)
Balance, value (108,775) (108,858) (85,737) (56,402) (57,961) (55,008) (108,858) (57,961) (108,775) (56,402)   (87,239) (52,519)
Restatement Adjustment | Accumulated Other Comprehensive Income(Loss)                          
Statement of Stockholders' Equity                          
Balance, value 12,252 12,586 9,969 6,307 7,110 7,468 9,969 7,468 9,969 7,468 9,969 7,468 4,433
Foreign currency translation adjustment                     5,973 2,501 3,035
Balance, value 15,941 12,252 12,586 7,988 6,307 7,110 12,252 6,307 15,941 7,988   9,969 7,468
Restatement Adjustment | Accumulated Deficit                          
Statement of Stockholders' Equity                          
Balance, value (121,110) (98,323) (97,208) (64,268) (62,118) (59,987) (97,208) (59,987) (97,208) (59,987) (97,208) (59,987) (30,851)
Net income (loss)     (1,115)     (2,131) (23,902) (4,281) (27,508) (4,403) (26,731) (37,221) (29,136)
Balance, value $ (124,716) $ (121,110) $ (98,323) $ (64,390) $ (64,268) $ (62,118) $ (121,110) $ (64,268) $ (124,716) $ (64,390) $ (123,939) $ (97,208) $ (59,987)