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Consolidated Statements of Equity Statement - USD ($) $ in Thousands | Total | Common Stock [Member] | Common Stock Including Additional Paid in Capital [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Parent [Member] | Noncontrolling Interest [Member] | SIlver Spring Networks, Inc. [Member] Common Stock Including Additional Paid in Capital [Member] | SIlver Spring Networks, Inc. [Member] Parent [Member]
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Beginning balance (in shares) at Dec. 31, 2017 |  | 38,771,000 |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2017 | $ 805,632 |  | $ 1,294,767 | $ (170,478) | $ (337,873) | $ 786,416 | $ 19,216 |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | (145,270) |  |  |  | (145,666) | (145,666) | 396 |  |
Other Comprehensive Income (Loss), Net of Tax | 17,883 |  |  | 17,883 |  | 17,883 |  |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | (981) |  |  |  |  |  | (981) |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 62,000 |  |  |  |  |  |  |
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense) | 2,883 |  | 2,883 |  |  | 2,883 |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross |  | 338,000 |  |  |  |  |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Gross | 0 |  | 0 |  |  | 0 |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture |  | 2,000 |  |  |  |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture | 207 |  | 207 |  |  | 207 |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  | 8,000 |  |  |  |  |  |  |
Stock Issued During Period, Value, Employee Stock Purchase Plan | 501 |  | 501 |  |  | 501 |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | 7,888 |  | 7,888 |  |  | 7,888 |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs | (7) |  | (7) |  |  | (7) |  |  |
Adjustments to Additional Paid in Capital, Other |  |  |  |  |  |  |  | $ 4,140 | $ 4,140
Ending balance (in shares) at Mar. 31, 2018 |  | 39,181,000 |  |  |  |  |  |  |
Ending balance at Mar. 31, 2018 | 704,603 |  | 1,310,379 | (152,595) | (471,812) | 685,972 | 18,631 |  |
Net Income (Loss) Attributable to Parent | (123,127) |  |  |  |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2017 |  | 38,771,000 |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2017 | 805,632 |  | 1,294,767 | (170,478) | (337,873) | 786,416 | 19,216 |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | (121,710) |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (14,768) |  |  |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2018 |  | 39,400,000 |  |  |  |  |  |  |
Ending balance at Sep. 30, 2018 | 712,332 |  | 1,326,719 | (185,246) | (449,273) | 692,200 | 20,132 |  |
Net income (loss) attributable to noncontrolling interests | 1,417 |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent |  |  |  |  | 2,657 |  |  |  |
Beginning balance (in shares) at Mar. 31, 2018 |  | 39,181,000 |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2018 | 704,603 |  | 1,310,379 | (152,595) | (471,812) | 685,972 | 18,631 |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 3,773 |  |  |  |  | 2,657 |  |  |
Other Comprehensive Income (Loss), Net of Tax | (33,273) |  |  | (33,273) |  | (33,273) |  |  |
Contribution from noncontrolling interests | 481 |  |  |  |  |  | 481 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 26,000 |  |  |  |  |  |  |
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense) | 655 |  | 655 |  |  | 655 |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross |  | 60,000 |  |  |  |  |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Gross | 0 |  | 0 |  |  | 0 |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture |  | 2,000 |  |  |  |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture | 207 |  | 207 |  |  | 207 |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  | 10,000 |  |  |  |  |  |  |
Stock Issued During Period, Value, Employee Stock Purchase Plan | 627 |  | 627 |  |  | 627 |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | 8,317 |  | 8,317 |  |  | 8,317 |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs | (16) |  | 16 |  |  | (16) |  |  |
Adjustments to Additional Paid in Capital, Other |  |  |  |  |  |  |  | (2,388) | $ (2,388)
Ending balance (in shares) at Jun. 30, 2018 |  | 39,279,000 |  |  |  |  |  |  |
Ending balance at Jun. 30, 2018 | 682,986 |  | 1,317,781 | (185,868) | (469,155) | 662,758 | 20,228 |  |
Net income (loss) attributable to noncontrolling interests |  |  |  |  |  |  | 1,116 |  |
Net Income (Loss) Attributable to Parent | 19,882 |  |  |  | 19,882 |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 19,787 |  |  |  |  | 19,882 |  |  |
Other Comprehensive Income (Loss), Net of Tax | 622 |  |  | 622 |  | 622 |  |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | (1) |  |  |  |  |  | 1 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 63,000 |  |  |  |  |  |  |
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense) | 2,364 |  | 2,364 |  |  | 2,364 |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross |  | 38,000 |  |  |  |  |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Gross | 0 |  | 0 |  |  | 0 |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture |  | 3,000 |  |  |  |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture | 158 |  | 158 |  |  | 158 |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  | 17,000 |  |  |  |  |  |  |
Stock Issued During Period, Value, Employee Stock Purchase Plan | 992 |  | 992 |  |  | 992 |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | 6,292 |  | 6,292 |  |  | 6,292 |  |  |
Adjustments to Additional Paid in Capital, Other | (868) |  |  |  |  |  |  | $ (868) |
Ending balance (in shares) at Sep. 30, 2018 |  | 39,400,000 |  |  |  |  |  |  |
Ending balance at Sep. 30, 2018 | 712,332 |  | 1,326,719 | (185,246) | (449,273) | 692,200 | 20,132 |  |
Net income (loss) attributable to noncontrolling interests | $ (95) |  |  |  |  |  | (95) |  |
Beginning balance (in shares) at Dec. 31, 2018 | 39,498,000 | 39,498,000 |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | $ 734,048 |  | 1,334,364 | (196,305) | (425,396) | 712,663 | 21,385 |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | (149) |  |  |  | (1,907) | (1,907) | 1,758 |  |
Other Comprehensive Income (Loss), Net of Tax | (1,780) |  |  | (1,780) |  | (1,780) |  |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | (517) |  |  |  |  |  | (517) |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 20,000 |  |  |  |  |  |  |
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense) | 889 |  | 889 |  |  | 889 |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross |  | 319,000 |  |  |  |  |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Gross | (720) |  | (720) |  |  | (720) |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture |  | 2,000 |  |  |  |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture | 157 |  | 157 |  |  | 157 |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  | 19,000 |  |  |  |  |  |  |
Stock Issued During Period, Value, Employee Stock Purchase Plan | 869 |  | 869 |  |  | 869 |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | $ 7,048 |  | 7,048 |  |  | 7,048 |  |  |
Stock Repurchased During Period, Shares | (165,000) |  |  |  |  |  |  |  |
Stock Repurchased During Period, Value | $ (7,814) |  | (7,814) |  |  | (7,814) |  |  |
Ending balance (in shares) at Mar. 31, 2019 |  | 39,693,000 |  |  |  |  |  |  |
Ending balance at Mar. 31, 2019 | 732,031 |  | 1,334,793 | (198,085) | (427,303) | 709,405 | 22,626 |  |
Net Income (Loss) Attributable to Parent | $ 34,386 |  |  |  |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2018 | 39,498,000 | 39,498,000 |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | $ 734,048 |  | 1,334,364 | (196,305) | (425,396) | 712,663 | 21,385 |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 38,145 |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | $ (10,749) |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares | (529,396) |  |  |  |  |  |  |  |
Stock Repurchased During Period, Value | $ (25,000) |  |  |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2019 | 39,533,000 | 39,533,000 |  |  |  |  |  |  |
Ending balance at Sep. 30, 2019 | $ 761,916 |  | 1,335,353 | (207,054) | (391,010) | 737,289 | 24,627 |  |
Net income (loss) attributable to noncontrolling interests | 3,759 |  |  |  |  |  |  |  |
Beginning balance (in shares) at Mar. 31, 2019 |  | 39,693,000 |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2019 | 732,031 |  | 1,334,793 | (198,085) | (427,303) | 709,405 | 22,626 |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 20,117 |  |  |  | 19,446 | 19,446 | 671 |  |
Other Comprehensive Income (Loss), Net of Tax | 3,736 |  |  | 3,736 |  | 3,736 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 39,000 |  |  |  |  |  |  |
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense) | 1,501 |  | 1,501 |  |  | 1,501 |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross |  | 7,000 |  |  |  |  |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Gross | (920) |  | (920) |  |  | (920) |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture |  | 3,000 |  |  |  |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture | 158 |  | 158 |  |  | 158 |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  | 17,000 |  |  |  |  |  |  |
Stock Issued During Period, Value, Employee Stock Purchase Plan | 742 |  | 742 |  |  | 742 |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | $ 6,420 |  | 6,420 |  |  | 6,420 |  |  |
Stock Repurchased During Period, Shares | (364,000) |  |  |  |  |  |  |  |
Stock Repurchased During Period, Value | $ (17,186) |  | (17,186) |  |  | (17,186) |  |  |
Ending balance (in shares) at Jun. 30, 2019 |  | 39,395,000 |  |  |  |  |  |  |
Ending balance at Jun. 30, 2019 | 746,599 |  | 1,325,508 | (194,349) | (407,857) | 723,302 | 23,297 |  |
Net Income (Loss) Attributable to Parent | 16,847 |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 18,177 |  |  |  | 16,847 | 16,847 | 1,330 |  |
Other Comprehensive Income (Loss), Net of Tax | (12,705) |  |  | (12,705) |  | (12,705) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 58,000 |  |  |  |  |  |  |
Stock Issued, Value, Stock Options Exercised, Net of Tax Benefit (Expense) | 2,317 |  | 2,317 |  |  | 2,317 |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross |  | 65,000 |  |  |  |  |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Gross | (552) |  | (552) |  |  | (552) |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture |  | 2,000 |  |  |  |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture | 158 |  | 158 |  |  | 158 |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  | 13,000 |  |  |  |  |  |  |
Stock Issued During Period, Value, Employee Stock Purchase Plan | 799 |  | 799 |  |  | 799 |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | $ 7,123 |  | 7,123 |  |  | 7,123 |  |  |
Ending balance (in shares) at Sep. 30, 2019 | 39,533,000 | 39,533,000 |  |  |  |  |  |  |
Ending balance at Sep. 30, 2019 | $ 761,916 |  | $ 1,335,353 | $ (207,054) | $ (391,010) | $ 737,289 | $ 24,627 |  |
Net income (loss) attributable to noncontrolling interests | $ 1,330 |  |  |  |  |  |  |  |

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